BIOLOGY 3UU3 Lecture Notes - Lecture 4: Paraceratherium, Weaning, Actual Size
15 Apr 2017
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How can body size alone explain so many features of active and resting metabolism and all of these other aspects of physiology and even ecology (the intrinsic rate of increase of population is allometric) There"s a conservation of biochemistry across huge ranges of phylogeny. About 3. 5-4 billion years of evolution with high conservation of this basic biochemistry, most of which was worked out at the single-cell level. Because we have conserved biochemistry, the fundamental mechanisms that is seen in mouse and elephants aren"t that different: the rates and degree of them will be but because of that conservation, we can look across species. That biochemistry, looking at ectotherms and endotherms: birds are around 44, placental mammals (internal incubation of embryo) have temperatures of about 37, temperature of mouse is about 37 as well. The biochemistry has largely been tuned to a certain thermal environment that it"s working best at.
