PSYC 215A Lecture Notes - Lecture 5: Exocytosis, Axon Hillock, Axon Terminal
6 Mar 2018
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Document Summary
Epsps produced at the same time, but on separate parts of the membrane, do not influence each other. If produced at the same time but close together they will add to form a larger epsp. Postsynaptic graded potentials: they are graded when they start (small to large, they decrease in size (degrade) as they travel over the membrane. Integrate or cancel each other out over time and space. Junction of cell body and axon: action potential originates here, rich in voltage sensitive sodium channels, where epsps and ipsps are combined. 5 is before 2 because d is farther away from the axon hillock. Ab epsp but before they reach the axon hillock c cause an ipsp. Chemical stimulation to make second heart beat. Presynaptic membrane: encloses molecules that transmit chemical messages. Synaptic cleft: small space separating presynaptic terminal and postsynaptic dendritic spine. Postsynaptic membrane: contains receptor molecules that receive chemical messages. Microtubule: transport structure tht carries substances to axon terminal.
