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2 Histo08

Epithelia

QuestionAnswer
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.
Created by: ceres