Biology 2601A/B Lecture Notes - Lecture 3: Ectotherm, Poikilotherm, Homeothermy
10 Oct 2018
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Temperature: intensity of motion by atoms in object. Temp of substance proportional to product of mean square speed of random motions and molecular mass. Ectotherm: rely on external temp to determine body temp. Heterotherm: more than 1 temp set point (switch b/w homeo/poikil) Regional endothermy/heterothermy: diff body temp in diff parts of body. Relationship b/w temp/mr in ectotherm temp effect rate of chem rxn inside organism (mr) Graph: o2 consumption goes up exponentially w/temp, which impacts how it moves around. How temp change occur: determine motion (rate of molecules encounter each other) heats speeds it up temp effect tertiary structure/binding site (affinity) Effect rate of encounter and shape of active site (alters affinity) Ectoderm like to keep temp in range where enzyme is optimize. Adaption: evolutionary response, time scale changes in gene/ns eg. alpine vs lowland plants. Lowland plants could possibly grow like alpine (ability to climitize)
