BIO231B Lecture Notes - Lecture 3: Basal Lamina, Epithelium, Goblet Cell
Document Summary
Covers outside of body, lines organs and cavities. Arranged in continuous sheets, single & multiple layers. Classified by shape of cells and layering pattern. General structure: apical surface faces body surface, cell secretions, cilia, microvilli, lateral surface face adjacent cells on either side, basal surface deepest layer, adheres to basement membrane, basement membrane basal lamina, reticular lamina, function. Forms outer covering of skin and some internal organs. Forms inner lining of blood vessels, ducts, body cavities. Forms interior of digestive, urinary, reproductive systems: glandular. Apical surface- surface facing the lumen or external environment. Basal (or basolateral) surface- region closest to the basement membrane. Epithelial tissues polarity and absorption/secretion: absorption- from apical region to basal region, secretion - from basal region to apical region. Vascularity - blood vessels in connective tissue provide nutrients to epithelium. In epithelial tissues damaged cells are replaced using stem cells (usually near basement membrane). Glands: secrete into ducts onto surface or into bloodstream.
