BIOL3030 Lecture Notes - Lecture 21: Heat Shock Protein, Acclimatization, Jugular Vein
15 Mar 2017
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Core temperature fluctuations: boom and bust reflection. Furnace that needs fuel: hot needs a lot of fuel. Close to 37 degrees celsius, but more distal: changes temp. Can"t go below freezing temp of blood: 0. Warm blood come from the heart, pass down the leg, close to blood that is returning. Exchange of energy, really efficient transfer of heat. Transfers heat to cold blood so it never freezes. But needs to be flexible so some heat loss in whale appendages. Artery next to vein in cotal fluke/fore flipper. Vertebrates in hot environment approach denaturation of proteins. Desert vertebrates: heat exchange systems that cool. Not countercurrent: carotid supplies blood to vein wraps around other vessels to exchange heat. Surface vessels of facial nasal and jugular vein: cooled by respiration. Cavernous sinus: cooler blood draws heat out of the brain. Jugular associates with carotid to cool arterial blood before it gets to brain.
