BLG 10A/B Lecture Notes - Lecture 4: Circulatory System, Macrophage, Elastin
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Recap: tissues, group of similar cells that have specific common function individual body cells are specialized, labour = divided. Histology: study of tissues and their cellular organization. Epithelial tissue sheets of cells that covers body surface or lines body cavity (creates boundaries) 2 main types (by location: covering and lining epithilia: on internal and external surfaces, glandular epithelia***: secretory tissue in glands. Sensory reception: taste buds, olfactory membrane, sense of smell. 5 special characteristics of epithelial tissue: polarity. Apical surface: upper surface exposed to exterior; free body/cavity of internal organ. 1 | p a g e: innervated but avascular. Simple epithelium* = 1 layer (cid:314) found where absorption, secretion, and filtration occur. Stratified epithelium** = more than 1 layer (cid:314) common in high abrasion areas where protection is necessary (cid:314) named according to shape of cells in apical layer: cell shape/type of cell.
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