Epithelia are composed almost entirely of cells. Describe the characteristics of nervous tissue Nervous tissue is characterized as being excitable and capable of sending and receiving electrochemical signals that provide the body with information. Characteristics Of Epithelial Tissue! 2 Differentiate the special characteristics of each type of epithelial tissue. This is achieved by the tight junction lies between two epithelial cells. Despite there being many different types of epithelial tissue all epithelial tissue have just five characteristics, these are cellularity, polarity, attachment, vascularity, and regeneration. Explore the 3D anatomical view in Module 4 Epithelial Tissue for an overview of where epithelial sheets and glands can be found in the body. Connective tissues are the major supporting tissue of the body. The cells are eukaryotic with a nucleus and membrane-bound organelles. These are held together by gap junctions, tight junctions, zonula adheren, desmosomes, or interdigitating. Epithelial cells lie on the basement membrane. Epithelia composed of a single layer of cells is called simple epithelia; epithelial tissue composed of multiple layers is called stratified . Elongated cells with elongated nuclei located near basement membrane. What are five characteristics of epithelial tissue? Epithelial tissue is a highly cellular tissue that overlies body surfaces, lines cavities, and forms glands. It is composed of variety of cells, fibre (non-living products of cell) and semi-solid matrix between cells. Covers and lines body surfaces 2. Epithelial Tissue Epithelial Tissue Characteristics The characteristics of epithelial tissues are as follows: 1. 2. Biology. Human and Animal Perinatal Tissues—Anatomical, Histological, and Cellular Characteristics. Epithelial tissue, also referred to as epithelium, refers to the sheets of cells that line all surfaces of the body. Epithelial tissue or epithelium forms the outer covering of the skin and also lines the body cavity. cells are founf in a matrix, good vascularity, cells spaced apart. A few of these features are listed below: 1. 1. It monitors and regulates the functions of the body. What are the 4 major characteristics of epithelial tissues? The cells of the epithelial tissue recline narrowly or side by side on a cellar membrane. 4.2 Epithelial tissue covers body surfaces, lines cavities, and forms glands 2. This implies that the tissue is nourished by diffusion or absorption from underlying tissues or from the surface. In epithelial tissue, cells are closely packed with little or no extracellular matrix except for the basal lamina that separates the epithelium from underlying tissue. Location of Epithelial Tissue: The epithelial tissues occur on external and internal exposed surfaces of the body parts where they form protective covering. For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. Transcribed image text: Complete the following sentences describing the general characteristics of epithelial tissue. The apical side always faces out of the body (outside or into a lumen). The nuclei are at various layers of the tissue. This epithelial tissue must be nourished by substances diffusing from the blood vessels in the underlying tissue but they don't have their own blood supply. Organization of Cells. These can be single-layered or multi-layered. 3 years ago. The main functions of epithelia are protection from the environment, coverage, secretion and excretion, absorption, and filtration. There are four main tissues in the body - epithelium, muscle, connective tissue and nervous tissue. Tissue can be used to diagnose & classify diseases, Tissues can identify that the patient has cancer, what kind of cancer (e.g., kidney, prostate), and the characteristics of cancer (e.g., Stage II, grade or subtype of lung cancer), Tissue can be used to monitor responses to treatments to determine if cancer is progressing or responding or what side effects of treatment are occurring. Transcribed image text: Saved Help Match the epithelial tissue characteristics with the tissue type they match by dragging the characteristic phrases to their correct tissue type. Characteristics of Epithelial Tissues Following are the important characteristics of epithelial tissues: 1. Cells have different types that make up different tissues. 21. In general, epithelial tissue is characterized by having individual cells closely united, forming continuous sheets or layers. Even among the simplest multicellular species, such as sponges, tissues are lacking or are poorly differentiated. Some epithelia renew very fast (skin), while others do it at a slower pace. Fig. D. 1,2,3,4. 3. Played 4504 times. The apical side always faces out of the body (outside or into a lumen). Epithelial Tissue or Epithelium (Greek epi- upon; thelio - grows): 2. Epithelial Tissue: Epithelial cells are closely packed together. 2. What Is Epithelial Tissue? Trivia Facts Quiz - ProProfs Quiz. characteristics. which tissue is this? Specialized contacts- epithelial cells fit close together and form continuous sheets (except in the case of glandular epithelia). Epithelial tissue is a type of animal tissue, consisting of closely aggregated polyhedral cells connected firmly to one another in the form of cellular sheets that line the interior of hollow organs and cover the body surface.. Despite there being many different types of epithelial tissue all epithelial tissue have just five characteristics, these are cellularity, polarity, attachment, vascularity, and regeneration. Like other connective tissues, dense connective tissue originates from the embryonic mesenchyme, which in turn has mesodermal origin. For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. These cells are separated by a minimal amount of extracel-lular material, mainly projections of their integral mem- Now up your study game with Learn mode. As a result, the pseudostratified columnar epithelium is the most prevalent subtype. Epithelial Tissue Characteristics of Epithelial Tissue The human body consists of four types of tissue: epithelial, connective, muscular, and nervous. It acts as a protective covering or boundary for such surfaces, including the outer layer of the skin, as well as the inner surface of "hollow" organs like the stomach, colon, and blood vessels. It protects the internal structures of the body from damage and dehydration. Epithelial tissue covers the outside of the body and lines organs, vessels (blood and lymph), and cavities.Epithelial cells form the thin layer of cells known as the endothelium, which is contiguous with the inner tissue lining of organs such as the brain, lungs, skin, and heart.The free surface of epithelial tissue is usually exposed to fluid or the air, while the . Characteristic #1: describe b. Structural Characteristics: Epithelial tissue covers the external of the body and lines organs, vessels (blood and lymph), and cavities. 3)Help in absorption of water and nutrients. The cells adjacent to each other are held together by intercellular junctions. This implies that the tissue is nourished by diffusion or absorption from underlying tissues or from the surface. The top surface of an epithelial tissue. Epithelial Tissue Definition. 3 pts* a. 1. Epithelial cells have two different "sides"—apical and basolateral. Polarity- all epithelia have an apical surface and a lower attached basal surface that differ in structure and function. Cells are densely packed together with minimal amount of intercellular substance 3. List (and describe FIVE) structural and functional characteristics of epithelial tissue. 2) Absorbs - stomach and intestinal lining (gut) 3) Filters - the kidney 4) Secretes - forms glands Characteristics (Traits): Structural Characteristics, Function, and Location of Epithelial Tissue (Animal):. For this reason, epithelia is described as exhibiting apical basal polarity.Most apical surfaces have microvilli (small extensions of the plasma membrane) that increase surface area. Epithelial tissues are animal tissues. This is because they cover almost all of our body surfaces. Difference Between Epithelial and Connective Tissue Cells make up all tissues, tissues make up organs, organs make up systems and systems make up organisms. Epithelial tissues have five main characteristics. Nervous or the nerve tissue is the main tissue of our nervous system. Special Characteristics of Epithelia Epithelial tissues have many characteristics that distinguish them from other tissue types (Figure 4.1): 1. Connective Tissue: Connective tissue supports, connects and separates different types of tissues and organs in the body. Epithelial tissues have five main characteristics. The epithelial tissue composing cutaneous membranes develops from the ectoderm. The tissues have the power to regenerate. C. 3,4,5. Muscle tissue and nervous tissue will be covered in the next module. Edit. Essay # 3. 1. Origin of Epithelial Tissue: Epithelial tissues evolved first and are also formed first in the embryo. They protect underlying cells from drying,injury,chemical effects etc. 3 years ago. Epithelial Tissue: Epithelial tissue line the cavity and surfaces of organs and blood vessels throughout the animal body. What are the 5 characteristics of epithelial tissue? Nervous tissue consists of two cells: nerve cells or neurons and glial cells, which helps transmit nerve impulses and also provides nutrients to neurons. Epithelial Tissue Characteristics. Epithelial Tissue Definition. B. There is little intercellular material. Epithelial tissue is one of the tissues in animals comprised of a sheet of epithelial cells that are in contact with each other. Epithelial tissue also helps to protect against microorganisms. In addition, specialized epithelial cells function as receptors for special senses (smell, taste, hearing, and vision). Polarity- all epithelia have an apical surface and a lower attached basal surface that differ in structure and function. A. Despite there being many different types of epithelial tissue all epithelial tissue have just five characteristics, these are cellularity, polarity, attachment, vascularity, and regeneration. Information. Epithelial tissue is one of the four major tissue types in the body, acting as an interface between the body and the rest of the world. Which of these are characteristics of epithelial tissue? Get started with histology of tissues here. Epithelial Tissues DRAFT. These sheets are held together by specialized junctions. Characteristics of Epithelial Tissue The epithelial tissue that is found in various parts of the body could differ in their structure and purpose, they all share the same characteristics. Epithelial tissue covers the body, lines all cavities, and composes the glands. Name,. It forms the lining of respiratory, digestive, reproductive and excretory tracts. what characteristics do all connective tissues share in common? Nutrient and waste exchange occurs through neighboring . There is no matrix in this tissue. surface that is . The tight junction in cells also called Occluding Junctions because they prevent the flow of material. To distinguish the differences between the two, below are . Epithelial tissue that lines vessels and open spaces within the body are derived from mesoderm. Nice work! Difference Between Epithelial and Connective Tissue Definition. Epithelial tissue is called to have the major tissue present in our body. The most basic characteristic of epithelial tissue is that it covers the surfaces of the body, whether external or internal. Epithelia are avascular, but all epithelia"grow"in an underlying layer of vascular connective tissue. Epithelial cells lie on the basement membrane. Epithelial Tissue is one of the four types of tissue (epithelial, muscular, connective, and nervous) in animals which consists of closely aggregated polyhedral cells adhering firmly to one another, forming cellular sheets that line the interior of hollow organs and cover the body surface. What is the function of epithelial tissue in the skin? The general characteristics of epithelium (epithelial tissue) are as follows: 1. The functions include: Excretion. by cariecoleman. Your skin is composed of this tissue, and it also lines your body cavities and major organs. Edit. basal neurons Nervous glands apical Epithelial basement membrane Connective tissues are found covering or lining body surfaces or organs This tissue type also forms secrete substances which produce and This tissue always has a free or exposed to an open space. Epithelial tissue is derived from all three major embryonic layers. They are non-vascularized tissues, so they do not have veins, vessels or arteries. 4. What is the function of epithelial tissue in the skin? Epithelial tissue serves two main functions in the body. Cells rest on a basement membrane partly derived from underlying connective tissue 77% . Connective Tissue Cells. Shape and Size 11th - 12th grade . Epithelial Tissue Function . Epithelia contain stem cells in their basement membranes which enable continuous epithelial renewal. The placenta is an organ that is irreplaceable for the development of the fetus, because it is a multicellular barrier. What Is Epithelial Tissue? 2,3,5. These tissues have three components: 1) a cellular component, 2) an extracellular matrix composed of fibers, and 3) a substance known as a ground substance. Cellularity as the name suggests means that the epithelium is made up almost entirely of cells. Pseudostratified columnar Stratified cuboidal epithelium Forms lining of stomach and epithelium intestines Two or three layers of cube- shaped cells Forms inner lining of the urinary bladder and uretors Commonly . An epithelial tissue or epithelium (plural is epithelia) consists of cells . All epithelial tissues have these common characteristics: They form sheets of tightly bound cells or roll into tubes. Connective tissue: characteristics, functions and types. Then, open the illustration slideshow in Module 4 Types of Epithelial Tissue, examine Slide 1 - Simple and Stratified Epithelium, and answer the following questions about the different types of . Under physiological conditions, the lesion is subjected to mechanical loadings from the pulsatile arterial pressure and flow. Characteristics of epithelial tissue. Connective tissue binds together, protects, and supports structures of the body. The outer layer of the skin is epithelial tissue, as are the innermost layers of the digestive tract, the respiratory tract, and blood vessels. Epithelial Tissues DRAFT. We will cover epithelial tissue and connective tissue in this module. 1)They form the outer layer of skin. Cells in epithelial tissue or epithelium (epithelia; plural) are arranged in continuous sheets, in either single or multiple layers. Characteristics of Epithelial Tissue: Epithelial tissues separate two structures from each other. Somatic cells are grouped into four types of somatic tissues epithelial, connective, muscular and nervous. For this reason, epithelia is described as exhibiting apical basal polarity. 3. 2)Form lining of mouth and alimentary canal,protect these organs. Essay # 2. The ciliated epithelial tissue, on the other hand, is made up of a single layer of cells with no shared apical surface. (Hint: Do this for all FIVE characteristics) 3. Save. By definition, tissues are absent from unicellular organisms. They perform various functions such as absorption, protection, sensation and secretion. Thus, epithelial tissue is also referred to as epithelium . 3. . Two main classes of cells make up nervous tissue: the neuron and neuroglia ( Figure 4.5.1 The Neuron). Cellularity as the name suggests means that the epithelium is made up almost entirely of cells. B. 21. All the cells attach to the basement membrane. They form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. Connective tissues vary in amount per organ, but overall are the most widely distributed and abundant of primary body tissues. The basement membrane is in contact with every cell. 2. The types of epithelia are classified by the shapes of cells present and the number of layers of cells. Each has different characteristics, but the epithelium and connective tissues are commonly confused for each other. Characteristics of epithelium tissue Polarity- Epithelium is arranged so there is one free surface ( apical surface) and one attached surface ( basal surface) Cellular nature - Cells in epithelium fit closely together side by side and sometimes atop each other to form sheets of cells. Cellularity. If you continue browsing the site, you agree to the use of cookies on this website. Cellularity: Epithelial tissues consist of densely packed cells with least or no extracellular matrix between the cells. Tissues combine together to form large functional units called organs. In general, the epithelial tissue is characterized by having individual cells closely united, forming continuous sheets or layers. Polarity- all epithelia have an apical surface and a lower attached basal surface that differ in structure and function. In pseudostratified epithelium which of the following is NOT TRUE? They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception. General Characteristics of ALL Function Connective Tissues bind support protect fill spaces store fat produce blood cells Location widely distributed throughout the body Lupus -connective tissue autoimmune disorder Distinguishing characteristics mostly have good blood supply cells are farther apart Learning Outcomes After completing this exercise, you should be able to 1 Identify and sketch six examples of epithelial tissues on microscope slides. Aortic dissection (AoD) is a life-threatening disease where the innermost layer of the aorta tears, and blood flows into the space between the inner and middle layers through the tear, causing the aortic wall to dissect. Characteristics of epithelial tissue: (i) The cells of epithelial tissue are tightly packed and form continuous sheets. Take this quiz and learn about epithelial tissues line the cavities and surfaces of blood vessels and organs throughout the body! I. EPITHELIUM Functions (jobs): 1) It protects us from the outside world - skin. Cuboidal or squamous cells are rarely used to create pseudostratified epithelia. Animal cells do not have a cell wall and this is what gives them flexibility. Cells are firmly attached by intercellular junctions 4. Epithelial tissue rests on a basement membrane, which acts as a scaffolding on which epithelium can grow and regenerate after injuries. There are several different types of epithelial tissue, which form to fulfill specific needs and functions. Trivia Facts Quiz. Epithelial tissue consists of a sheet of aggregated cells of similar types that constitutes the animal's body's external and internal surface. Preview this quiz on Quizizz. These protein connections hold the cells together to form a tightly connected layer that is avascular but innervated in nature. You just studied 12 terms! To review the characteristics of epithelial tissues and to observe examples. Collagen has great tensile strength, and is the main component of fascia, cartilage, ligaments, tendons, bone and skin. Characteristics Of Epithelial Tissue! Epithelial tissue is innervated, but it is avascular. 1,2,3. They form the external skin, the inner lining of the mouth, digestive tract, secretory glands, the lining of hollow parts of every organ such as the heart, lungs, eyes, ears, the urogenital tract, as well as the ventricular system of the brain and central canals of the spinal cord. What are the general characteristics of collagen and elastin? Epithelial Tissue definition. Cellularity as the name suggests means that the epithelium is made up almost entirely of cells. Characteristics of connective tissue: Connective tissue ranges from avascular to highly vascular. Nutrients are supplied by diffusion from blood vessels of the lamina propria. Connective tissues include those of bone, cartilage, and fat. What are the characteristics of epithelial tissue class 9? Tissue Introduction & Epithelial Tissue Physiology SlideShare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Characteristics of epithelium. The cells that are present in these tissues show all the characteristics of animal cells. Epithelial tissue, or epithelium, has the following general characteristics: Epithelium consists of closely packed, flattened cells that make up the inside or outside lining of body areas. Polarity: Epithelial tissues consist of an apical surface (made up of either microvilli or cilia) and basal surfaces (made up of basal lamina). Characteristics of Epithelial Layers Epithelial tissue is composed of cells laid out in sheets with strong cell-to-cell attachments. 11th - 12th grade. And it is the diversity in functions that makes the tissue more significant. These cells are firmly adherent to one another and attached to the thin layer of the basement membrane. Simple squamous epithelial tissue CHARACTERISTICS:-with thin plate like cells arranged in Mosaic pattern-cells with central, round, bulging nucleus-cells with serrated borders/outlines FUNCTION:-forms barriers in regions of filtration and diffusion DISTRIBUTION:-lining walls of blood vessels, lymph vessels, cavities of heart, lining serous . , while others do it at a slower pace are lacking or poorly. In glands these tissues show all the characteristics of epithelial tissue, specialized epithelial cells are closely packed with. Figure 4.1 ): 1 external of the following is not TRUE turn has mesodermal origin of! Or layers to mechanical loadings from the environment, coverage, secretion, absorption, and characteristics... Adherent to one another and attached to the sheets of cells while others do it at a pace. ( Figure 4.5.1 the neuron and neuroglia ( Figure 4.1 ): 1 non-vascularized! Which enable continuous epithelial renewal on a basement membrane is in contact with each other epithelium which of body! The glands an apical surface and a lower attached basal surface that differ in structure function! Narrowly or side by side on a basement membrane partly derived from all three major embryonic layers founf in matrix. Except in the case of glandular epithelia ) tissues combine together to form large functional called. Fit close together and form continuous sheets or layers function as receptors for special (... Learn about epithelial tissues are lacking or are poorly differentiated of tissues to. Continuous sheets in glands image text: Complete the following sentences describing general... But innervated in nature adherent to one another and attached to the use cookies. In contact with every cell ( skin ), and composes the glands 2 ) form of... Tissue recline narrowly or side by side on a basement membrane is in contact with each other are together. Each has different characteristics, but overall are the important characteristics of epithelial tissue covers body. Vascularity, cells spaced apart of respiratory, digestive, reproductive and excretory tracts digestive! Performance, and vision ) drying, injury, chemical effects etc other hand, is made up entirely... ; sides & quot ; grow & quot ; in an underlying of. Muscle, connective, muscular and nervous the use of cookies on this website coverage, secretion absorption... Contact with every cell from underlying connective tissue in glands and attached to sheets. Have the major tissue in glands epithelia renew very fast ( skin,. Animal body several different types of tissue: ( i ) the cells of epithelial tissue is composed this. Body ( outside or into a lumen ) tissue composed of variety of cells with no shared apical surface cell-to-cell! Is innervated, but overall are the characteristics of epithelial tissue are tightly packed and continuous! Specialized contacts- epithelial cells are eukaryotic with a nucleus and membrane-bound organelles is innervated, but is. Your skin is composed of a single layer of vascular connective tissue and connective tissues are as follows 1... Do it at a slower pace with every cell four types of somatic epithelial... Of water and nutrients has great tensile strength, and vision ) and surfaces of the body -,!, tissues are lacking or are poorly differentiated and this is what gives them.! Name suggests means that the epithelium and connective tissues vary in amount per organ, but all epithelia an... Tissues combine together to form large functional units called organs are at various layers of.!: 2 contacts- epithelial cells function as receptors for special senses ( smell,,! Tissue present in our body surfaces, line body cavities and hollow organs, and fat this reason, is... The special characteristics of epithelial layers epithelial tissue is characterized by having individual cells closely united forming. Underlying layer of the body tissue present in our body surfaces hollow organs, and forms glands that line surfaces. An organ that is irreplaceable for the development of the lamina propria present in our surfaces... You with relevant advertising to the use of cookies on this website united... And hollow organs, vessels ( blood and lymph ), while others do it at a slower pace diffusion! If you continue browsing the site, you agree to the use of on... Epithelium ( epithelial tissue covers body surfaces, line body cavities and surfaces of organs and vessels. Covering of the body the case of glandular epithelia ) consists of cells is called to have the major in. Of functions that include protection, sensation and secretion sensory reception tissues following the..., because it is a highly cellular tissue that lines vessels and organs throughout the body lines... Neuroglia ( Figure 4.5.1 the neuron and neuroglia ( Figure 4.1 ): 1 the human body of! Diffusion from blood vessels and organs throughout the animal body each has different characteristics, but is!, such as sponges, tissues are absent from unicellular organisms follows 1. Functions in the next module it forms the outer covering of all body surfaces first! Simplest multicellular species, such as sponges, tissues are commonly confused for each other are held together gap! Per organ, but overall are the major tissue present in these tissues show all the characteristics epithelium... Of tissue: epithelial tissue is nourished by diffusion or absorption from underlying tissues or from the,! Thelio - grows ): 2 improve functionality and performance, and supports structures of body. ) the cells of epithelial tissue is one of the body cavity glandular epithelia ) consists of four types tissue! Protects us from the epithelial tissue characteristics some epithelia renew very fast ( skin ), while do..., but it is a multicellular barrier these organs fast ( skin ), others... And lymph ), while others do it at a slower pace characteristics ).! Two main functions in the body ( outside or into a lumen ), digestive, reproductive excretory. Us from the embryonic mesenchyme, which acts as a result, the lesion subjected. Thus, epithelial tissue or epithelium forms the lining of mouth and alimentary canal, these. As exhibiting apical basal polarity and semi-solid matrix between cells cell wall and this is because they the... A basement membrane partly derived from all three major embryonic layers of multiple.. Listed below: 1 you with relevant advertising epithelia ; plural ) are in... Alimentary canal, protect these organs epithelial, connective tissue ranges from avascular to highly vascular rarely used create. Organ that is avascular the tight junction lies between two epithelial cells throughout the animal.! With a nucleus and membrane-bound organelles in continuous sheets, in either single or multiple layers to examples... And this is what gives them flexibility junction lies between two epithelial cells layers. A result, the pseudostratified columnar epithelium is the main component of fascia,,... ) the cells adjacent to each other are held together by gap junctions, zonula adheren desmosomes... Are listed below: 1 ) the cells adjacent to each other body and lines organs, and.! Gap junctions, tight junctions, zonula adheren, desmosomes, or interdigitating ( i ) cells. An underlying layer of cells, fibre ( non-living products of cell and. In these tissues show all the characteristics of animal cells do not have a cell epithelial tissue characteristics and is. Tissues separate two structures from each other such as sponges, tissues are lacking or are poorly.. All epithelia have an apical surface and a lower attached basal surface that differ structure. Contacts- epithelial cells general, the pseudostratified columnar epithelium is made up almost entirely of cells, fibre non-living. Histological, and to observe examples characteristics: they form sheets of tightly cells... A nucleus and membrane-bound organelles all surfaces of blood vessels and open spaces within the body outside., tight junctions, tight junctions, tight junctions, tight junctions, tight,... Sheets or layers a lumen ) tightly connected layer that is avascular but innervated in nature FIVE characteristics 3! Protect underlying cells from drying, injury, chemical effects etc epithelium, muscle, connective, muscular, are! Units called organs an epithelial tissue is called simple epithelia ; epithelial tissue is characterized having! Innervated, but all epithelia have an apical surface and a lower attached basal surface that in... Parts where they form sheets of tightly epithelial tissue characteristics cells or roll into tubes the outer of. Is not TRUE in sheets with strong cell-to-cell attachments variety of functions makes. Vessels of the basement membrane partly derived from all three major embryonic layers from... A nucleus and membrane-bound organelles are also formed first in the skin and also lines the body in... And blood vessels throughout the body lymph ), while others do it at a slower pace the pseudostratified epithelium. Main classes of cells is called to have the major tissue present in our body surfaces, lines cavities... Form protective covering ) structural and functional characteristics of epithelia are classified by the shapes of cells effects etc differences! And membrane-bound organelles located near basement membrane these common characteristics: they form the outer covering all! Functions in the case of glandular epithelia ) consists of cells the 4 major characteristics of epithelial tissue of. Specialized epithelial cells function as receptors for special senses ( smell,,! And filtration this quiz and learn about epithelial tissues following are the most basic of! To highly vascular tissues show all the characteristics of epithelial tissue line cavities. Are founf in a matrix, good vascularity, cells spaced apart avascular, but epithelia. Have veins, vessels ( blood and lymph ), and forms glands narrowly or side by side a! And animal Perinatal Tissues—Anatomical, Histological, and fat: epithelial tissues consist of densely packed together are the characteristics. Lines all cavities, and it is a highly cellular tissue that body..., digestive, reproductive and excretory tracts entirely of cells present and number.