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Thermoregulation Lecture 5

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Dalhousie University
BIOL 1011
Marty Leonard

Thermoregulation, Osmoregulation and Excretion Homeostasis = steady state. Internal body temp. stays constant regardless of changes in external temperature. Thermoregulation Maintain body temp in range that allows cells to function effectively • Metabolism will decrease with a decrease in body temperature. • Hemoglobin would not bind to O2 as well 1. Ectotherms a. Depend on environment for heat b. Internal temp can vary because of these c. Usually insects, fish, amphibians and reptiles d. Some ectotherms have stable internal temp because the place where they lives’ temp does not vary a lot, i.e. the bottom of the ocean 2. Endotherm a. Gain most of heat metabolically b. Birds, humans/mammals c. Considered to keep body temp at a narrow range d. Can still gain heat from environment as well (a lot of overlap to these categories) Temperature Regulation (Ectotherm) 1. Radiation from sun 2. Conduction of heat from rock 3. To cool down – convection from breeze 4. Open its mouth, allows for evaporation of water 5. Constrict cells at surface to reduce heat loss Temperature Regulation (Endotherm) 1. Metabolic heat production (thermogenesis) a. Muscle contraction i. Shivering ii. Moving b. Hormones (non-shivering thermogenesis) i. Epinephrine ii. Thyroxin 2. Holding heat in a. Fur b. Fluffing fur allows for layer of air for insulation (same as Goosebumps) 3. Vas
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