BSCI 207 Lecture Notes - Lecture 13: Ectotherm, Thermoregulation, Countercurrent Exchange
26 Jan 2016
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Bsci207 - lecture 13 - gas exchange and bulk flow in animals. Longitudinal blood vessels at surface of body. Warm blood goes out toward extremities allows heat to be retained in core. Temperature of big red swimming muscles on y axis. Isothermal line shows what red and blue lines would look like if they matched environmental temperature. All tunas (red swimming muscles) are warmer than environment. Difference between bluefin tuna and skipjack/yellowfin tuna. Skipjack and yellowfin are more susceptible to changes in temperature (able to increase muscle temperature only a fixed amount above isothermal temp 2 degrees) When water temperature is higher not adjusting temperature as much. Adjusts temperature a lot when water temperature gets cold. Regulate their own body temperature regardless of fluctuating external temp. Maintenance of a relatively constant tissue temperature. Most endotherms thermoregulate (usually by modulating their endothermy) Ectotherms rely on the external environment to regulate their internal body temperature.
