Frog Nerve

1305 Words Mar 25th, 2016 6 Pages
Frog Nerve
Exercise 1: Action Potential Threshold
Using the Horizontal Compression buttons and the scroll bar display the data you wish to include in your report.

Study Questions 1. How does a CAP differ from a single action potential? 1. How does a CAP differ from a single action potential?
Answer
CAP or compound action potential is a measure of the sum of the "all or none" single action potential of a group of fibers in a single nerve. The single action potentials are events that occur when sodium channels are activated causing the depolarization of a neuron. Single Action potentials are considered to be all or none responses, they travel down the length of the axon and then release a neurotransmitter into the synapse.
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This means that at a lower voltage only the larger diameter axons will be stimulated and elicit a smaller response however, at higher voltages even the smaller axons will be stimulated and elicit a response. So because there are a collection of different neurons with varying sizes only some will be activated at lower voltages and as the voltage increases so will the amount of neurons which produce action potentials therefore raising the total response and giving the “graded” response observed. 3. What was the smallest voltage required to produce the maximum (largest) CAP? What proportion of the nerve fibers were excited to produce this maximal response? 3. What was the smallest voltage required to produce the maximum (largest) CAP? What proportion of the nerve fibers were excited to produce this maximal response?
Answer
The smallest voltage required to produce the maximum CAP was 300 mV. In order to produce the maximal response in theory all of the nerve fibers would need to be excited because as the answer given above noted the graded response of the sciatic nerve would increase until all of the nerve fibers have been excited and then it would hit maximal CAP because at a voltage of 300 mV all nerve fibers would be excited and no further action potentials could arise. 4. In this exercise, you examined the effect of increasing stimulus intensity on the nerve. What other stimulus parameter

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