BIOL3030 Lecture Notes - Lecture 22: Marine Iguana, Evaporative Cooler, Membrane Fluidity
4 Apr 2017
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Document Summary
Ice fish adapted to -2 - 2 degrees celsius water. Whether enzyme will function at high temp, how long it could function. 37 degrees celsius: function for 3 minutes. Coupling: environment it evolved in and suitability of temperature for enzymatic process. Enzymes work fine at 37 degrees bc evolved that way. Thermal stability of enzymes is related to habitat. Reflected in molecular structure and sturcture of cells. Fluidity is kept relatively constant at respective temperature of species by evolution of different membrane phospholipid compositions. Harder to move across membranes in cold temperatures. Membrane fluidity is increased in species: evolved in environments that were very cold. Acute changes: temperature regulation: over seconds or minutes. Absorbing solar radiation: ectotherms: behavioral to regulate own temperature. Ectotherms regulate so much that temperature doesnt change that much. Models cant move but lizards can change location even if environment is wide range of temperature. Vasoconstriction: narrowing, lumen of vessel constricts and blood goes elsewhere.
