BIPN100 Sheet 2

BIPN100 Sheet 2 - Patricia Pepa OH Friday 11-11:50AM Caf...

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Patricia Pepa OH: Friday 11-11:50AM Café Roma Handout 2 I. Graded vs. Action Potentials a. Graded Potentials i. How does the amplitude change with distance? ____________________ ii. Is it proportional to stimulus? ___________________________________ iii. Summation- 2 or more stimuli can be added together Temporal Summation Several impulses from one neuron over time Spatial Summation Several impulses from several neurons close by iv. Where are they found in the neuron? ______________________________ b. Action Potentials i. How does the amplitude change with distance? ______________________ ii. Is it proportional to stimulus? _____________________________________ iii. Can action potentials be summated? _______________________________ iv. Where are they found in the neuron? _______________________________ II. Mechanism of Action Potential a. Property How does this feature contribute to action potential? Threshold The current of ____ ions coming into the cell exceed the current of ____ions going out of the cell. If depolarization from stimulus exceeds threshold, AP is fired. VG Na+ Channels Depolarization triggers voltage sensor. Na+ _________ gate opens very very fast. Na+ rushes into the cell, down its _________ ________. Na+___________ gate closes channel and Na+ stops flowing in. VG K+ Channels Depolarization triggers voltage sensor. Channels open very slowly. K+ flows out of the cell, slowly, down its concentration gradient.
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This note was uploaded on 03/31/2010 for the course BIMM bimm 100 taught by Professor Dr.sato during the Winter '08 term at UCSD.

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BIPN100 Sheet 2 - Patricia Pepa OH Friday 11-11:50AM Caf...

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