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- W2082301660 abstract "A theory to account for the evolution of heat production for endothermy in the vertebrates is presented. It is argued that thermoregulatory responses to cold, thyroxine, and the Na+ pump are related functionally and phylogenetically.Fish regulate their body temperature behaviorally. For example, if the ambient temperature is too cold, they exhibit appetitive behavior and swim to an area where it is warmer. The incidental heat produced by the increased activity is lost through the gills due to the pattern of circulation. In fish the increased requirement for oxygen during increased activity demands an increased transfer of oxygen and of ions and water across the gill membranes. Thus, any increase in oxygen demand causes an obligatory stimulation of the Na+ pump. The evolution of endothermy (that is, of non-shivering thermogenesis) from behavioral thermoregulation of fish can be envisioned as a bypassing of the behavoiral response of fish and a direct stimulation of the Na+ pump to produce heat. The attraction of this argument is the ubiquity of Na+ transport across membranes.It is also argued that thyroxine was selected for as one type of control. Thyroxine could be selected as a control mechanism because its main function in fish is ion regulation. In addition, thyroxine effects the general level of spontaneous activity, increases chill resistance, alters the ability to sense salinity, and also alters the behavioral response of fish to changes in temperature. The argument is further supported by recent observations which indicate that a major fraction of the thyroxine induced elevated metabolic rate in mammals is due to stimulation of the Na+ pump. The above suppositions may also explain why the internal temperature sense of mammals is so sensitive to Na+, and may in fact suggest one possible feedback signal in homeotherms." @default.
- W2082301660 created "2016-06-24" @default.
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- W2082301660 date "1973-03-01" @default.
- W2082301660 modified "2023-10-10" @default.
- W2082301660 title "The evolution of endothermy" @default.
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- W2082301660 doi "https://doi.org/10.1016/0022-5193(73)90260-9" @default.
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