BIO 203 Lecture Notes - Lecture 2: Venous Blood, Thermoregulation, Uric Acid
16 Nov 2016
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Document Summary
The end products of ingested foods are typically co2 and metabolic h2o. Metabolic breakdown of proteins also produces ammonia (nh3) or nitrogenous waste. Some animals convert it into less toxic forms. Excretion of nitrogenous wastes trade-offs = energy expenditure vs. water conservation. Require lots of water to eliminate gram of. An index of molecular motion (average kinetic energy) Cold - low heat content, low energy content, low molecular motion, low temperature. All elements have passive and regulated components. Heat transfer through physical contact (solids, liquids) Surface area (a) of contact influences ease of movement. Length between objects ( ) influences ease of movement. Composition of interface influences ease of movement. Physiologists are interested in rates of movement (flow) Occurs when environmental medium (air or water) moves over the body surface. Free convection - environmental medium not mechanically moved. Passive movement (hot air rises, convective currents) Forced convection - environmental medium physically moved (external factor is cause of movement)
