Biology 2601A/B Lecture Notes - Lecture 5: Thylakoid, European Route E6, Potential Gradient
6 Oct 2015
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Internal constancy and the physiological regulatory systems that automatically make adjustments to maintain it. The condition of a relatively stable internal physiological environment, usually involving extensive feedback mechanisms. Works to return the value to the set point. Many cell signaling pathways that regulate cytoplasm composition. Vaso-constriction and dilation regulate heat loss in vertebrates. Maintaining rates of reactions by altering pathways and enzymes. Maintain performance in the face of varying conditions: requires a shift away from the acute response (short time scale responses, plasticity on the order of hours to days to weeks. High metabolic rate in summer, low in winter. Move up and down curve through year implications for organisms. Some species settle for this (see graph above) Showing the change of temperature, and enzyme substrate affinity. Both cases = same enzymes from 2 different thermal fish. 1 declines rapidly as move temperature up large q10.
