PHGY 209 Study Guide - Final Guide: Resting Potential, Nernst Equation, Afferent Nerve Fiber

• School: McGill University
• Department: Physiology
• Course: PHGY 209
• Professor: Melissa Vollrath

Document Summary

[(cid:862)(cid:374)ot a si(cid:374)gle ato(cid:373) that is i(cid:374) (cid:455)our (cid:271)od(cid:455) toda(cid:455) (cid:449)as there (cid:449)he(cid:374) that e(cid:448)e(cid:374)t took pla(cid:272)e(cid:863) steve grand (computer scientist)] Spinal cord=highway of processing information (relaying up to brain and down to periphery of body) and mediates automated activities (ex. walking) Afferent fibers or sensory neurons bring information from periphery to spinal cord (ex. skin sensations) Neurons use electricity to propagate information from a place to another. There is probably from a hundred trillion to a quadrillion of synapses in human nerv. syst. Soma: cell body, containing nucleus, where metabolic and synthetic activities take place, maintaining neuron in living state. Dendrites: (cid:862)a(cid:374)te(cid:374)(cid:374)as(cid:863) of (cid:374)euro(cid:374), for i(cid:374)for(cid:373)atio(cid:374) to flo(cid:449) i(cid:374) Axon: unique, for information to flow out (initial segment inserts in (cid:272)ell so(cid:373)a, pres(cid:455)(cid:374)apti(cid:272) ter(cid:373)i(cid:374)al=s(cid:449)elli(cid:374)g at a(cid:454)o(cid:374)"s end) Resting membrane potential: the inside of a neuron has a slightly negative voltage(=electrical pressure) compared to the outside (-60mv to -70mv, tiny fraction of unpaired negatives charges, less than 1%).