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zoo141 (ch4)
epithelial tissues (features, intercellular connections and types) and GLANDS
| Question | Answer |
|---|---|
| what are the three main features of epithelial tissues? | covers surfaces, forms secretory glands and avascular = lacks blood vessels |
| cover exposed surfaces and line internal cavities and passageways; contain secretory or gland cells | Epithelia |
| derived from epithelia, but secretory cells predominate | Glands |
| secrete onto external surfaces or into internal passageways (ducts)"SECRETIONS RELEASED INTO DUCTS" | Exocrine glands |
| secrete hormones or precursors into the interstitial fluid, usually for distribution by the bloodstream. "SECRETIONS RELEASED INTO INTERSTITIAL FLUID". | endocrine glands |
| form a barrier that isolates the basolateral surfaces and deeper tissues from the contents of the lumen | occluding junctions |
| locks together the terminal webs of neighboring cells, strengthening the apical region and preventing distortion and leakage at the occluding junctions | adhesion belt |
| provide firm attachment between neighboring cells by interlocking their cytoskeletons | desmosomes |
| attach the deepest epithelial cells to the basal lamina | hemidesmosomes |
| permit chemical communication that coordinates the activities of adjacent cells | gap junctions |
| aka basement membrane, complex structure produced by the basal surface of the epithelium and the underlying connective tissue | basal lamina |
| what type of epithelial tissue has one layer of cells? | simple |
| allows diffusion or absorption, due to thin layer of cells | simple squamous |
| single layer of cube-shaped cells | simple cuboidal |
| single layer of column-shaped cells | simple columnar |
| looks like multiple layers, but is not | pseudo stratified columnar |
| what type of cells have many layers? | stratified |
| upper most cells, flattened; can be keratinized or nonkeratinized | stratified squamous |
| uppermost cells, cuboidal | stratified cuboidal |
| rare, most often found lining large ducts such as those of the salivary glands or pancreas. May have either two layers or multiple layers. | stratified columnar |
| allows stretch in urinary tract | transitional epithelium |
| secretion by exocytosis | merocrine |
| apical portion of cells bursts to release secretions | apocrine |
| entire cell bursts to release secretions | holocrine |
| "exocrine gland structure" has single duct | simple |
| "exocrine gland structure" ( ) duct divides one or more times on way to gland cells | compound |
| "exocrine gland structure" glandular cells form tubes | tubular |
| "exocrine gland structure" glandular cells form sac-like pockets | alveolar (acinar) |
Created by:
btuehara
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