Psychology 2221A/B Study Guide - Midterm Guide: Ion Channel, Axon Terminal, Membrane Potential

• School: Western University
• Department: Psychology
• Course: Psychology 2221A/B
• Professor: Cross-Mellor

Document Summary

Membrane potential: the difference in electrical charge between the inside and outside of a cell. Resting potential: -70mv, a neuron with tis charge across its membrane is polarized. Ions are unevenly distributed, more na+ ions outside the cell and more k+ inside the cell. Two kinds of acetylcholine receptors: nicotine and muscarine. Graded responses: epsps and ipsps are graded responses, the amplitudes of epsps and ipsps are proportional to the intensity of the signals that elicit them, weak signal = small postsynaptic potential, strong = large. Epsps and ipsps: travel passively from their site of generation at synapses, usually on dendrites or cell bodies, almost instantaneous transmission. Chapter 4: transmission is decremental: decrease in amplitude as they travel through the neuron, travel short distances. Integration: adding or combining a number of individual signals into one overall incoming signal. When the membrane potential is depolarized to the threshold of excitation by an.