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2 Histo08
Epithelia
Question | Answer |
---|---|
Vocab: occluding junction (zonula occludens), desmosome (macula adherens), junctional complex, cilia, basal, mesothelium, basal lamina, fibrous lamina, basement membrane | simple squamous, endothelium, simple cuboidal, simple columnar, stratified squamous keratinized, stratified squamous non-keratinized/wet-keratinized, stratified cuboidal, pseudostratified columnar ciliated with goblet cells, transitional, apical |
More vocab; morphology, lumen, goblet cells, balloon cells | intercellular junctions, gap junction, hemi-desmosome, microvillus, stereocilia |
The four basic tissue types: | epithelia, connective, muscle, nervous tissue kleenex, kimwipes, hankies, that pink stuff from Victoria's Secret |
ALL Epithelia share these: Also, they're avascular. One exception...what on earth could it be? | Forming of sheets/tubes. Little intercellular space (crowded in here), attached by basal lamina/basement membrane. Lining of outside and insides. |
Basal lamina is NOT the basement membrane. What's the difference? | Basal lamina is just collagen and a few proteins secreted by epithelial cells. Basement membrane is basal lamina PLUS the fibrous lamina, secreted by fibroblasts. |
4 functions of epithelia: | 1. Protection. 2. Absorption--intestinal cells absorb ions and nutrients 3. Secretion--Stomach acid and enzymes, kidney and ions, salivary and mammary glands...well... 4. Sensory: Auditory, olfactory |
Simple epithelia | single layer |
stratified epithelia | multiple layers |
Simple squamous | single layer, very flat, central nucleus. Fried egg. |
Endothelium | Specialized simple squamous, lines heart, blood, and lymphatic vessels |
Mesothelium | Specialized simple squamous, lines major serous cavities, covers internal organs. |
Simple cuboidal epithelium | Individual cubes, in sweat glands, some kidney tubules. i_i_i_i |
Simple columnar epithelium | |_|_|_| Taller from base to apex. Lines small intestines. All nuclei line up in a row at same level in basal aspect. |
Goblet cells | Modified simple columnar; produce and secrete mucus in respiratory system, small intestine, colon. |