PSYC 251 Study Guide - Comprehensive Final Exam Guide - Memory, Action Potential, Neurotransmitter

• School: University of Victoria
• Department: Psychology
• Course: PSYC 251
• Professor: none

Document Summary

Denoted structures of brains and connected mind + body . (cid:862)neuro(cid:374)(cid:863) ter(cid:373) h. w. waldeyer (1891) Dendrites (input) -> cell body -> axon (output) Axon hillock -> (nodes of ranvier + myelin sheath) -> axon. Prevents flow of ion proteins and other water-soluble molecules. Concentration gradients = more na outside/ more k inside. More na(+) channels open: voltage gated k(+) channels open. Another action potential cannot be generated yet: refractory period. Voltage gated k(+) channels close when membrane is hyperpolarized (bellow resting potential) Membrane returns to steady state at resting potential. Hodkin-huxley model: mathematical model of action potentials. Slow, self-regenerating, travel long distance: saltatory conduction. Fast, self-regenerating, travel long distances: speed. Passing signal form one cell to next. Travels from synapse to axon hillock (trigger zone) by electronic conduction. Strength at trigger zone depends on synapse. Psps from same synapse sums together: neuronal circuits and info processing. To determine if neuron c will fire.