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PSYB65H3 (519)
Ted Petit (310)
Lecture 4

PSYB65- Lecture 4.docx

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Ted Petit

PSYB65 Lecture 4In the membrane of the neuron there are pores referred to as ion channels when the neuron is stimulated these ion channels open up and allow sodium positively charged inside of the cell normally the electrical charge inside of the neuron is sitting at a negative charge but as more and more sodium comes then it becomes more and more positive charge goes up and down but when too much sodium comes in you reach a threshold which opens up all the pores in the immediate vicinity and becomes extremely positive causes a very large spike referred to as an action potential if it is positive inside of the cell then more pores open up inside of the cell allowing more to come inside when action potential gets to the end of the axon then you come to the contact point between two cells which is referred to as a synapse inside of the axon terminal are synaptic vesicles which have a chemical in them that transmit information transmitter substances space between axon and dendrite is referred to as the synaptic cleft membrane of the dendrite have ion channels as well and they are associated with its receptorsStep number one there has to be a system for synthesis step number two transmitters have to be stored inside of the synaptic vesicles there are chemicals that keep them from being packaged whenever there is an action potential the transmitter substance has to be released there are drugs that can interfere either fa
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