BIO 203 Lecture Notes - Lecture 3: Hyperthermia, Reaction Rate, Basal Metabolic Rate
13 Jan 2016
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Large driving force for heat exchange from foot to ice - signi cant heat loss to environment. Small driving force for heat exchange from foot to ice - minimal heat loss to environment. Arteries and veins in close contact: high surface area of contact between arteries and veins, high rate of heat transfer from arterial to venous blood. Returning blood warmer - less energy needed to re-warm blood: small driving force - less heat loss. There is a small temperature gradient along entire length of contact which serves as driving force for heat exchange. Birds and mammals need to maintain core t,b (body temp: humans - core t,b ~ 37c, birds - core t,b ~ 39c. Extremities can get much colder than core t,b but returning blood needs to be reheated. Tuesday, september 1, 2015: allows extremities to get cold very important for animals producing endogenous heat, homeostasis core stays constant but extremities can vary a lot.
