CAS BI 211 Study Guide - Midterm Guide: Resting Potential, Axon, Action Potential
29 Sep 2016
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Bi211- physiology exam 1 vocab study guide- action potentials. Neuron: a single nerve cell, nerve fiber means the same thing. Send one type of signal in one direction. Send electrical signals within cell, chemical (neurotransmitters) between cells. Depolarized: no distinct different between sides, nearer to equilibrium (cell becomes. Hyperpolarized: cell is even more polarized than normal resting state of -70mv. Resting membrane potential: the voltage of an excitable cell at rest. 70 mv, more negative inside than outside of cell. More na+ on outside of cell, more k+ inside. Equilibrium potential: the electrical and chemical gradients are equal in strength and want to flow in opposite directions, balancing net flow. A cell will never reach this because na+ and k+ have different equilibrium potentials. Action potential: impulse sent down a neuron that causes a change in resting membrane potential. Rapid depolarization allows inside of cell to temporarily be more positive than the outside.
