BIO 200 Lecture Notes - Lecture 8: Urinary System, Peristalsis, Muscular System
7 Dec 2017
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Mammals are endothermic (control body temp by metabolism) aka need food constantly. Amphibians are ectothermic, they do not control their temperature internally: (cid:862)a(cid:373)phibios(cid:863) (cid:373)ea(cid:374)s double life in greek- life on water and land, skin (epidermis) of frog is thin to absorb water and air. Reptiles were the 1st animals to lay amniotic eggs, protects their young from drying out: skin of gecko is thick and dry for protection. Fish live in water and reproduce in water by laying eggs in water. Amphibians live near water and most lay eggs on land. Mammals and birds mostly live away from water. ** frogs are amphibians, humans are mammals but they both are vertebraes bc they have a backbone. But frog does not have a ribcage as humans do. Metamorphis- method by which a tadpole born in water, is transformed into a frog where it can survive both land and water. 3rd eyelid= nictitating membrane, protects eye when frog goes underwater.
