BIOL 111 Lecture Notes - Keratin, Convergent Evolution, Himalayas
ghaniamerabia and 32 others unlocked
44
BIOL 111 Full Course Notes
Verified Note
44 documents
Document Summary
Walked with legs under body (quadrapedal or bipedal) Ancestor to birds was probably a theropod dinosaur: bipedal, 3 hind toes, carnivorous, 4-chambered heart, similar lungs, endothermic, feathered, hollow bones, parental care of eggs and juveniles. Not a direct ancestor of common birds crow-sized feathers (avian) teeth (non-avian) High amount of parental care: most build nests, incubate eggs, feed juveniles. Body temperature control thermoregulation source of body heat: ectotherms. Mr increase with increasing temperature: endotherms. Generate heat internally through metabolic processes leaky ion channels may have led to the evolution of endothermy. Mr increases when temperatures are outside of the optimal range. Physical: too hot: increase blood flow to periphery, sweating, panting, too cold: decrease blood flow to periphery, shiver, orientation relative to heat source, basking, huddling, moving locations throughout day, insulation (fur, feathers, fat, surface area: volume. Example: counter-current heat exchanger: fast, pelagic fish (tunas, sharks, heat generated by swim muscles, heat retained in muscles.