BIOL 1107 Chapter Notes - Chapter 48.1: Ectotherm, Lipid Bilayer, Thermoregulation
Document Summary
Animal cells can only survive within 0 -45 . Below 0 , lipid bilayer changes from a fluid to a frozen gel, disrupting cell functions. Above 45 , most proteins and nucleic acids unfold from functional form. Thermoregulation is based on negative feedback pathways in which temperature receptors detect changes from a set point. Responses triggered by negative feedback mechanisms involve adjustments in rate of heat-generating oxidative reactions coupled with adjustments in the rate of heat gain or loss at body surface. Organismal performance : rate and efficiency of an animal"s biochemical, physiological, and whole-body processes. Within 0 -45 range, organismal performance varies greatly. Conduction : flow of heat between atoms or molecules in direct contact. Convection : transfer of heat from a body to a fluid, such as air or water, that passes over itself. Movement maximizes heat transfer by replacing fluid that has absorbed/released heat with fluid at the original temperature.
