BIOL 111 Lecture Notes - Lecture 21: Amphisbaenia, Squamata, Archaeopteryx

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Rudiger Krahe

Document Summary

How to get up into the air: feathers, better lungs, lighter bones. 4-chambered heart (completely separate pulmonary and systemic circuits) Diverse beaks: diverse diets (carnivores, herbivores, nectarivores ) Sources of body heat: ectotherms, endotherms, absorbs external heat, generate own internal heat through metabolic processes, how do endotherms generate heat, less efficient at transforming energy (e. g. , lose energy as heat when converting food into atp, or atp into adp) In the field, a lizard actually maintains body temperature at a different temperature than its environment. Thermoregulations: orientated relative to heat source, basking, huddling and varying contact with, mechanisms to maintain body temperature, behavioural heat surface, moving locations throughout day, physiological, physical, too hot: increase blood flow to periphery seating, panting, too cold: decrease blood flow to periphery, shiver, insulation (fur, feathers, fat, surface area: volume, colour. Flying & endothermy demand large amount of oxygen. Some birds able to fly at high altitudes (30,000"+)