PSYB65H3 Study Guide - Midterm Guide: Axon Hillock, Motor Neuron, Axon Terminal
Document Summary
He produced a hyperpolarizing graded potential (inhibitory postsynaptic potentials) on the receiving motor-neuron membrane. Ipsps increases charge on membrane away from the threshold level and decrease the probability that an action potential will result. *temporal summation: 1 excitatory pulse of stimulation is delivered and is followed later by a second excitatory pulse, 1 epsp recorded & after delay 2nd identical epsp recorded. Delay between epsp shortened, 2 occur in rapid succession, single large epsp is produced. 2 excitatory pulses are summed (added produce a larger membrane depolarization) *spatial summation: 2 imputs close together are summed, far apart aren"t. *na influx associated with epsp added to efflux of k associated with ipsp. *back propagation: reverse movement of ap from axon hillock into the dendrites (for learning) *dendrite of touch is wrapped around hair base, hair is pulled opens stretch-sensitive channels in the dendrite"s membrane.
