BIOLOGY 3XL3 Chapter Notes - Chapter 5: Swordfish, Scombridae, Opah
4 Feb 2017
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Adaptation of muscles for diverse activities heat. Regional heterothermy: found in certain ectotherms (tuna) and endotherms (dolphin: endotherm: heat generated by metabolism, homeotherm: maintaining a constant body temperature, ectotherm: body takes on temperature of environment. Not homeotherms because they do not maintain a constant body temperature: heterotherm: maintain a constant temperature of some parts of their body. Tuna: more internalized rm compared to other fishes aids in heat retention. Heat generated by the muscle heats up the venous blood that is leaving. In a normal fish, heat goes into the environment through the gills because water has a much higher heat capacity (major barrier for these animals to be homeotherms) Tuna venous system transfers heat to arterioles that are bringing oxygenated blood to the muscles. All heat transferred so when the venus blood goes to the gills it"s already at the sa(cid:373)e te(cid:373)perature as the water = no heat loss.
