BIOL 111 Lecture Notes - Lecture 21: Amniote, Pulmonary Circulation, Uric Acid
15 Nov 2018
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What are the innovations allowing reptiles to get out of the water altogether? (e. g. no longer need to lay egg in the water, surviving without having to have moist skin ) More efficient excretory system (to get rid of waste) Reptilia subclasses: lepidosauria (lizards, snakes, testudinia (turtles,, crocodilia (crocodiles, alligators, aves (birds) Respiration breathe via lungs only (whereas amphibians can also through its skin and gills in larva) Must conserve water (to no dry out: skin is waterproofed by keratin (a protein in the skin that is water insoluble, produce a special nitrogenous waste (called uric acid) Reproduce & develop on land: internal fertilization amniotic egg. Fish single circuit & 2 chambered heart (inefficiency: pumping blood through the gills lower pressure when it has to go to the rest of the body) They started developing a 4 chambered heart (which help maintain the separation of deoxygenated & oxygenated blood)
