ZOO 2090 Lecture Notes - Lecture 19: Cool Air, Diphyodont, Acrodont
18 Mar 2013
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Document Summary
Blood shunt in the skin to disapate or keep it in the body. Recycled heat is maintained close to body core, minimizing losses to the environment. Between the blood and the vessel there is no gas exchange because the walls are too thick but heat can go through. Exchanged with the blood that goes through the body. Temperature is much lower the blood that goes through the fin. Gradient of exchange is minimized at the tip of the fin. Same principle can be used using a carotid rete and turbinate bones to cool the brain. Cool air come into extensive contact with blood in the turbinate"s, warming air before it gets to the lungs but also cooling blood that runs through the nose. This cool venous blood from the nose enters the carotid rete, where vessels multiple and are organized in opposite direction to the incoming carotid artery supplying the brain selective brain cooing.
