BIO 200 Lecture Notes - Lecture 22: Xeroderma, Internal Fertilization, Keratin
20 Nov 2018
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Document Summary
Reptiles: mastering art of living on land, traits of modern reptiles, synapsids and diapsids (w aside about therapsids, archosaurs & dinos, modern reptiles. Moving heavy bodies- new leg arrangement to run better. Gills fail in air- better lung efficiency. Bigger muscles need more o2- better heart efficiency. Amniotic eggs: egg w rich food source, watertight shell, 4 internal membranes for gas exchange (indep life system so no need for h20 gestation) Internal fertilization: sperm inside female + fertilize before membrane forms. Reptile & bird= ext gestation so babies dev outside. Dry skin: scales made of keratin to prevent water loss. Thoracic breathing: more efficient air intake compared to glottal. Glottal breathing in amphib= lung made of thin walled sacs attached. Thoracic breathing: lung w more sa; inflated & deflated by to mouth w glottis [limits air intake to vol of mouth] expansion and contraction of rib cage [limits air to size of lungs]
