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Lecture 5 1-16-08

Lecture 5 1-16-08 - Review I II III IV PSPs is generated by...

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Review: I. PSPs is generated by releasing translator from the presynaptic cell, open a channel for a few seconds. The type of channel determines the type of ion, positive or negative. A channel doesn’t let an ion of the opposite ion through. Sodium wants to rush because it goes with the concentration gradient. a. EPSPs i. Fire AP. You can only go positive 55 as the highest because that is the equilibrium potential for sodium. ii. If the reversal potential was above threshold iii. If two EPSPs have different effects because they are in different circuits b. IPSPs i. Transfer comes across, activates their channels and chlorine goes through. The equilibrium is more negative you see hyperconjucation. If it tries to go up but it is still inhibitory because it was still under the threshold. II. Summation of PSPs a. PSP Properties i. Local ‘graded’ responses ii. Amplitude: infinity # of ions flowing ( infinity # of receptors opened) 1. therefore it is a graded responses iii. Not “all or none,” not yet regenerative, not actively propagated (PSP
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Lecture 5 1-16-08 - Review I II III IV PSPs is generated by...

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