BIO230H1 Lecture Notes - Lecture 6: Basophil, Sensory Neuron, Stromal Cell
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BIO230H1 Full Course Notes
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Bio230 lecture 6 - tissue maintenance and stem cells (nov. 14) Past lectures: how multicellular organisms develop from single cell. Tissues regenerate constantly either at the cellular level or at the molecular level. Some tissues contain the same cells for the life of the organism, but the molecular components of these cells do turn over. But even though these cells present for whole life time, molecular components continually being regenerated. In both cases, cells and tissues associated with them have specialized architecture. Structures develop once during embryogenesis, hard to renew structure after. Cells of skin, cells lining digestive tract, blood cells. So(cid:373)e (cid:272)ells do(cid:374)"t (cid:272)ha(cid:374)ge fo(cid:396) (cid:449)hole life ti(cid:373)e. #1 ex: auditory hair cells in organ of corti inside ear. Ahc (red) embedded within epithelial layer of cells (brown) Specialized overall architecture (not just bricks forming wall like other epithelia) Have neurons connecting to them so can send nerve impulses to brain. How ahc detect sound involves 2 membranes:
