PSYCH 330 Study Guide - Midterm Guide: Resting Potential, Active Transport, Voltage-Gated Ion Channel

• School: UMASS-Amherst
• Department: Psychology & Brain Sciences
• Course: PSYCH 330
• Professor: Lori Astheimer Best

Document Summary

Within a neuron: electrical: neural electrical impulse: changes in the relative charge of the inside of the cell versus the outside of the cell. Resting neuron: unequal distribution of charges, electrical gradient, membrane potential (around -70, neuron is polarized. Depolarization: membrane potential becomes more positive (closer to zero, more positive charge inside the cell, excitatory. Hyperpolarization: charge inside cell becomes even more negative compared to the outside (further from zero, inhibitory. Ion channels and resting membrane potential: membrane has open leak channels for k+ and cl- but not na, k+ and cl- diffuse passively. Dynamic equilibrium: no net ow of ions in a resting neuron caused by opposing forces. Axon hillock: transition from chemically gated to voltage gated. Action potential details: voltage gated sodium channels have a lower threshold than potassium channels so they open sooner, when sodium rushes in, the inside of the cell becomes more positive which leads the potassium channels to open.