Biology 2601A/B Lecture Notes - Lecture 6: Light-Independent Reactions, Atp Synthase, Vasoconstriction
10 Dec 2016
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Document Summary
Works to return the value to the setpoint. Too hot increase heat loss (vasodilate, pant) body cools toward setpoint. Too cold decrease heat loss (vasoconstrict, heat production) body heats. Positive feedback loops are very rare in biology. Homeostasis is important for organisms both plants and animals. South georgian shag body temp of the bird as it dives into water that is 7c, it is. Sensor mechanisms that compare the body temp back to a set point different. Hormonal insulin & glucagon regulate mammalian blood sugar. Molecular cell-signaling pathways that regulate cytoplasm composition. Nerve-mediated vasoconstriction and dilation regulate heat loss in vertebrates. Biochemical maintaining rates of reactions by altering enzyme pathways. Acute response = doubling of enzymatic rate with increase in temp (q10) a way to. Some species are okay with this move up and down the single curve as the environment changes don"t have to do compensation, but there are costs.
