BIO 203 Lecture Notes - Lecture 7: Reversal Potential, Schwann Cell, Passive Transport
Document Summary
In cells in the resting state, pk > pna: therefore, k+ is the dominant ion and the membrane potential is close to (ek) Note, if the membrane is permeable to an ion and eion em, then the ion will cross the membrane pulling em towards eion. Resting membrane potential electrical signals: goldman-hodgkin-katz (ghk) equation: k+ is not the only ion contributing to the membrane potential, predicts membrane potential that results from the contribution of all ions that can cross the membrane. Atp; only open when atp is low) membrane gets hyperpolarized (beta cells are hyperpolarized b/c k+ channels are open; ligand-gated channel: ca2+ channel voltage-gated channel (hyperpolarized = closed; depolarized = open) concentration of. Ca2+ is low b/c channel is closed: glucose in plasma increase in concentration gradient of glucose glucose transported down its concentration gradient via glut or facilitated diffusion/ transport inc. aerobic metabolism inc. atp .
