BIOB34H3 Lecture 7: lecture 7 biob34
19 Oct 2016
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Equilibrium is state that all physical systems evolve towards: physical systems are trying to achieve, life forms not trying to achieve. Objects always more down potential energy gradients change in magnitiude of some value from one point to another: high to low p. e. Diffusion: molecules going down potential gradient, statistics by law of this, as particles randomly move it is going to occupy a space, go down chem gradient. Rate of diffusion=f: =(cid:3117) (cid:3118) cells do not have chemical equilibrium with their extracellular fluids. Homeostasis helps avoid equilibrium with external environment. Use energy to maintain chem gradiens that would otherwise disappear due to diffusion. (cid:373)ost a(cid:374)i(cid:373)als" (cid:271)odily fluids a(cid:396)e also (cid:374)ot i(cid:374) e(cid:395)uili(cid:271)(cid:396)iu(cid:373) (cid:449)ith the e(cid:374)(cid:448)i(cid:396)o(cid:374)(cid:373)e(cid:374)t: negative feedback fish keep concentration of salt in their body, expend lot of energy keeping salt in body than out electrical potential. Can measure difference in e. p in any 2 spots.
