identify three types of epithelial cell and where these cells are tissue are formed?
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Answers
Answer:
The number of cell layers and cell types together give rise to 6 different types of epithelial tissue.
Simple squamous epithelia.
Simple cuboidal epithelia.
Simple columnar epithelia.
Stratified squamous epithelia.
Stratified cuboidal epithelia.
Stratified columnar epithelia.
Explanation:
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Answer:
Epithelial tissues are identified by both the number of layers and the shape of the cells in the upper layers. There are eight basic types of epithelium: six of them are identified based on both the number of cells and their shape; two of them are named by the type of cell (squamous) found in them. Epithelial tissue is classified based on the number of cells, the shape of those cells, and the types of those cells.
Epithelial Tissue Cells
Cells Locations Function
Simple squamous epithelium
the cells are flattened and single-layered
Air sacs of the lungs and the lining of the heart, blood vessels and lymphatic vessels Allows materials to pass through by diffusion and filtration, and secretes lubricating substances
Simple cuboidal epithelium
the cells are cube shaped and single layered
In ducts and secretory portions of small glands and in kidney tubules Secretes and absorbs
Simple columnar epithelium
are rectangular and are attached to the basement membrane on one of their narrow sides, so that each cell is standing up like a column. There is only one layer of cells.
Ciliated tissues including the bronchi, uterine tubes, and uterus; smooth (nonciliated tissues) are in the digestive tract bladder Absorbs; it also secretes mucous and enzymes.
Pseudostratified columnar epithelium
the cells are column-like in appearance, but they vary in height. The taller cells bend over the tops of the shorter cells so that the top of the epithelial tissue is continuous. There is only one layer of cells
Ciliated tissue lines the trachea and much of the upper respiratory tract Secrete mucous; ciliated tissue moves mucous
Stratified squamous epithelium
many layers of flattened cells
Lines the esophagus, mouth, and vagina Protects against abrasion
Stratified cuboidal epithelium
contains many layers of cube-shaped cells
Sweat glands, salivary glands, and mammary glands Protective tissue
Stratified columnar epithelium
many layers of rectangular, column-shaped cells
The male urethra and the ducts of some glands. Secretes and protects
Transitional epithelium
many layers of irregularly shaped cells with diverse sizes
Lines the bladder, urethra and ureters Allows the urinary organs to expand and stretch