Test_04_5_Q - Test4&5; CBNS106; Lectures: 04 and 05...

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Test4&5; CBNS106; Lectures: 04 and 05 Page 1 of 3 Problem set for lecture 4 and 5: Action Potential Reading Assignment: Bear et al. Chapters 4 & 5 1. How does myelin help increase conduction velocity? Choose the correct option. A) It provides electrical insulation. B) It makes the membrane more excitable. C) It contains voltage-gated sodium channels. D) It increases axonal diameter. 2. What is the absolute refractory period? Choose the correct option. A) The period when the firing frequency is at about 1000 Hz. B) The time period of 1 msec after one action potential is initiated and before the next one is initiated. C) The period when it is difficult to initiate another action potential for several milliseconds due to sodium channel inactivation. D) The period when the membrane potential stays hyperpolarized until the voltage-gated potassium channels close. 3. The spike-initiation zone in most peripheral sensory neurons occurs near the sensory nerve endings. A) True B) False 4. The part of the neuron where an axon originates from the soma is called the ____. It is also called the spike-initiation zone. A) True B) False 5. What is meant by the action potential threshold? Choose the correct option. A) Critical level of depolarization required to trigger an action potential B) Critical level of hyperpolarization required to trigger an action potential C) The action potential threshold is the same as the generator potential D) Critical level at which electrical current is injected through a microelectrode
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This note was uploaded on 04/15/2008 for the course CBNS 106 taught by Professor Korzus during the Winter '08 term at UC Riverside.

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Test_04_5_Q - Test4&5; CBNS106; Lectures: 04 and 05...

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