PSY 102 Lecture Notes - Lecture 4: Resting Potential, Axon Terminal, Sodium Channel

• School: Ryerson University
• Department: Psychology
• Course: PSY 102
• Professor: Tisha Ornstein

Document Summary

Psy 102 - week 4 lecture 3 continued. Nodes of ranvier - gaps along axon where there"s no sheath. Some human nerve cells are 3ft long. All or none law - the principle that once an action potential is triggered in an. Structures of synapses axon, its propagated without decrement to the end of the fibre. Presynaptic membrane: membrane of a terminal button that lies adjacent to the postsynaptic membrane and through which the neurotransmitter is released buttons; contains molecules of a neurotransmitter. Synaptic vessel: a small, hollow, bead like structure found in the terminal. Synaptic cleft: space between the presynaptic membrane and postsynaptic. Must of calcium to release neurotransmitter from presynaptic cell. Tiny electrical charge in place btw the inside and outside of resting neuron. Selectively permeable: some ions can move more freely than others. Action potential : once a cell becomes stimulated potential to move toward a 0 (from -60) Depolarization - stimulation of cell causes resting membrane.