what are two basic roles of epithelial tissue?
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Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. Epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.
36928
['Simple. Simple epithelium consists of one layer of epithelial cells lying on a basement membrane. Cells can be squamous, cuboidal and columnar. ... ', 'Pseudostratified. Pseudostratified epithelium. ... ', 'Stratified. Stratified epithelium consists of two or more cell layers. ... ', 'Transitional. Urothelium.']
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Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. ... All glands are made up of epithelial cells.
1048384
Squamous epithelial cells are generally round, flat, and have a small, centrally located nucleus. The cell outline is slightly irregular, and cells fit together to form a covering or lining.
536595
['There are three principal cell shapes associated with epithelial cells: squamous epithelium, cuboidal epithelium, and columnar epithelium.', 'There are three ways of describing the layering of epithelium: simple, stratified, and pseudostratified.']
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['Epithelial tissue. covers body surfaces; lines body cavities, hollow organs, and ducts (tubes); and forms glands.', 'Connective tissue. ... ', 'Muscular tissue. ... ', 'Nervous tissue. ... ', 'Fibroblasts. ... ', 'Macrophages. ... ', 'Plasma cells. ... ', 'Mast cells.']
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The link between specialized cells and tissues is that tissues are made of specialized cells that work together. 3. In animals, cells specialize to form epithelial tissue, which lines body cavities and the outer surface of the body, protects structures, and forms glands.
140561
Although there are many types of cells in the human body, they are organized into four broad categories of tissues: epithelial, connective, muscle, and nervous. Each of these categories is characterized by specific functions that contribute to the overall health and maintenance of the body.
454005
Introduction. The oral mucosal epithelium is a barrier that separates the underlying tissues from their environment. It consists of two layers, the surface stratified squamous epithelium and the deeper lamina propria.
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['Epithelial Cells. These cells are tightly attached to one another. ... ', 'Nerve Cells. These cells are specialized for communication. ... ', 'Muscle Cells. These cells are specialized for contraction. ... ', 'Connective Tissue Cells.']
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Identify the four types of tissue in the body, and describe the major functions of each tissue. The four types of tissues in the body are epithelial, connective, muscle, and nervous.
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They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception. The cells in epithelial tissue are tightly packed together with very little intercellular matrix.
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The epithelial cells are nourished by substances diffusing from blood vessels in the underlying connective tissue. One side of the epithelial cell is oriented towards the surface of the tissue, body cavity, or external environment and the other surface is joined to a basement membrane.
450815
Simple squamous epithelia are found in capillaries, alveoli, glomeruli, and other tissues where rapid diffusion is required. Cells are flat with flattened and oblong nuclei. ... This epithelium is associated with filtration and diffusion. This tissue is extremely thin, and forms a delicate lining.
98305
The skin is an organ of protection The primary function of the skin is to act as a barrier. The skin provides protection from: mechanical impacts and pressure, variations in temperature, micro-organisms, radiation and chemicals.
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['protects the cell by acting as a barrier.', 'regulates the transport of substances in and out of the cell.', 'receives chemical messengers from other cell.', 'acts as a receptor.', 'cell mobility, secretions, and absorptions of substances.']
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Epithelium (/ˌɛpɪˈθiːliəm/) is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.