BIO 1300 Lecture Notes - Lecture 4: Keratin, Meristem, Thermoregulation
19 Feb 2016
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All material not including today, from last friday class. Up to slide 20 from skin part one (next 2 boxes are from last 2 slides from part one) Major substance that produces all extensions = keratin. Protect the finger, reduction of the claw allows for greater dexterity. Dead nail plate is attached to living tissue. Nail matrix = meristematic tissue give rise to the nail plate. Can see the meristem (aka the lunula) lighter coloured half moon tissue) Proximal nail fold, distal groove, mid distal groove protection. Matrix is constantly being produced, why we need to trim our nails often. Finger prints and wrinkles as an adaptation to wetness. Osmosis is travelling movement of water form low high concentration. If you cut the nerve that goes there, the osmotic process does not occur, thickening the finger print ridges. There is an active process of developing wrinkles.
