Biology 2601A/B Lecture Notes - Lecture 2: Ectotherm, Poikilotherm, Reaction Rate
3 Dec 2016
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Document Summary
Heat energy determines the temperature of something. Animals interact with their environment and different sources of heat energy and they create some of their own. Rabbit has certain temperature; it produces some metabolic heat, absorbs heat, and radiation from the environment, convection, conduction, cutaneous evaporation. Constant interaction between organism and its environment. Ectotherms rely on external temperatures to determine the tb. Homeotherms defend a constant body temperature. Poikilotherms allow body temperature to vary. Heterotherms have more than one temperature set point, or switch between homeo- and poikilothermy. Regional endothermy/heterothermy different tb in different parts of the body. Diff body temp (poikilotherms) + no internal heat (ectotherms) => plants. Diff body temp (poikilotherms) + internal heat (endotherms) => insects. Same body temp (homeotherms) + no internal heat (ectotherms) => lizards. Same body temp (homeotherms) + internal heat (endotherms) => mammals. Relationship between temperature and metabolism in an ectotherm. Metabolic activity depends on temperature (especially in ectotherms)
