BIO1110FINALNOTES - Lecture 29 Heat Exchange 1. Metabolism...

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Lecture 29 Heat Exchange 1. Metabolism - always gain heat 2. Radiation - All things above absolute 0 radiate heat - Either gain or lose heat - Basking (expose yourself to the sun by exposing the cross sectional parts of the body), Shade (reduce cross sectional parts exposed to the sun to reduce heat loss) 3. Conduction - Temperature effected by touching something from another surface that has a different - Neither gain or lose heat - Depends on the area of contact, one of the surface passes heat well or not, and if delta t is similar heat won’t be exchanged. 4. Convection - involves the bulk flow of hot particles into cooler temperatures (water or air). - Neither gain or loose heat - Deals with velocity as well 5. Evaporation - as water changes from a liquid phase to a gaseous phase, it will vaporize and remove heat from the creature. - Always loose heat. - Takes energy to evaporate liquid to gas to cool you off. Endotherms- most of the heat is being regulated by metabolism Ectotherms- conformers; they will use external temperatures to control their internal environments. They use high volume ratio to heat their bodies in the morning for the day. Heterotherms- creatures that can switch between the two types of strategies depending on the environment. Example: honey bees, use compartments to regulate body temperature Mass vs Metabolic rate - bigger animals have a higher metabolic rate. - Mass specific metabolic rate is mass at a specific metabolic rate. Liters of oxygen inhaled per mass. - Relatively small, big surface area, can loose heat easy. Metabolic rate needs to stay jacked up. - Big, generate a lot of heat in big volume, don’t loose heat due to small surface area. Countercurrent Exchange Method
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This note was uploaded on 01/08/2012 for the course BIO 1101 taught by Professor Gilbert during the Fall '08 term at Cornell University (Engineering School).

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BIO1110FINALNOTES - Lecture 29 Heat Exchange 1. Metabolism...

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