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Epithelium Tissue HB
Epithelium Tissue
| Question | Answer |
|---|---|
| Epithelial tissue functions: | -protection -absorption -filtration -secretion |
| Epithelial tissue | the lining tissue that forms the boundary between our body and the external environment |
| Epithelial tissue is classified by the... | -number of layers -shape of the cells |
| How many layers do simple epithelial tissues have? | one |
| How many layers do stratified epithelial tissues have? | more than one |
| Pseudostratified epithelium | one cell layer, some cells not tall enough to reach from one side to the other. |
| Three shapes of epithelial cells | squamous, cuboidal, columnar |
| Function of simple squamous epithelium | rapid diffusion of materials |
| Where is simple squamous epithelium found? | blood vessels and lungs |
| Function of simple cuboidal epithelium | secretion and absorption of substances |
| Where is simple cuboidal epithelium found? | tissues of the kidney |
| Function of simple columnar epithelium | secretion of mucus for protection and absorption of substances. |
| Where is simple columnar epithelium found? | lining of the digestive tract |
| Stratified squamous epithelium | thick layers of squamous cells |
| Where are stratified squamous epithelium found? | epidermal layers of the skin |
| stratified cuboidal epithelium | -more than one layer of cuboidal cells -rare in the body |
| Where is stratified cuboidal epithelium found? | salivary and mammary glands |
| Stratified columnar epithelium | -free surface is lined with columnar cells -rare in the body |
| Where is stratified columnar epithelium found? | larynx and male urethra |
| Where is pseudo-stratified epithelium found? | upper respiratory tract |
| transitional epithelium | the free surface cells of transitional epithelium vary in appearance based on the stretching of the tissue |
| Where is transitional epithelium found? | lining of urinary bladder |
| Gland | made of a group of cells that secrete a fluid substance |
| Exocrine glands | secrete substances outward through a duct |
| Endocrine glands | ductless glands that secrete hormones though the bloodstream |
| Merocrine gland | cells excrete products via exocytosis |
| Mero = | part |
| Examples of merocrine glands | sweat glands |
| Apocrine gland | a portion of cell pinches off with secreted product |
| Apo = | tip |
| Examples of apocrine glands | mammary glands |
| Holocrine gland | cells rupture and spill products into duct |
| Hol = | whole |
| Examples of holocrine glands | sebaceous (oil) glands |