Biology 2601A/B Lecture 3: bio 2601 LECTURE 3 temperature 2
8 Mar 2017
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L for latent heat exchange e. g. transpiration (evaporation through stomata), sweating through skin surface: m for metabolism e. g. metabolic heat generation in some plants. If you can increase convection, you remove energy from the surface (think of shaking out sweaty hands) Ir picture of maple leaf will show that it is not at one single temperature tips are coolest. Boundary area is harder to cool down because it does(cid:374)"t i(cid:374)te(cid:396)a(cid:272)t with wind. Where does ectotherm heat come from: plants: futile cycling (mitochondria, animals: muscle contractions (no net movement, but work being done to produce heat) Metabolism in animals: heat generation in flight muscles of bees and moths: normally metabolic rates are low and insect is not warm. In flight, rate is high so heat production is high thorax warmed by flight muscles exhibit endothermy only when active and usually just in thorax.
