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Quiz 2-22-11 Solutions

# Quiz 2-22-11 Solutions - The voltage will fall of slower...

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Question 1 It is possible to make APs travel faster by increasing the diameter of an axon. But myelination provides a much larger speedup for the same total axon diameter, even though that diameter has to be shared between the actual axon and the thickness of the myelin. Answer True False Question 2 Assume an infinite uniform passive cable with diameter d splits into 2 infinite uniform daughter branches, each having the diameter d/2 (with Rm and Ri the same as the parent branch). If you inject a current into the parent cable and plot the steady state voltage attenuation moving towards the branch point, which will you see: Answer The voltage will fall off exponentially with the lambda of the parent cable. The voltage will fall off faster than exponentially moving towards the branch point.
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Unformatted text preview: The voltage will fall of slower than exponentially moving towards the branch point. Can't tell from the information given. Question 3 Continuing the previous question, if you track the steady state signal moving down one of the (2 identical) daughter branches away from the branch point, which will you see: Answer The voltage will continue the same pattern of voltage attenuation (exponential or otherwise) as you saw in the parent branch moving towards the branch point. The voltage will fall off more steeply in the daughter branch. The voltage will fall off more gradually in the daughter branch. Can't tell from the information given....
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