Test_04_5_Answr - Test4&5 CBNS106 Lectures 04 and 05...

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Test4&5; CBNS106; Lectures: 04 and 05 Page 1 of 7 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. one is initiated. milliseconds due to sodium channel inactivation. 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. 6. What property of the voltage-gated potassium channels allows K+ ions to pass? Choose the correct option. allowing the K+ ions to pass.
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Test4&5; CBNS106; Lectures: 04 and 05 Page 2 of 7 membrane. disinhibited. channel to twist into a shape that allows the K+ ions to pass. 7. How does the sodium channel selectivity filter differentiate Na+ and K+ ions? Choose the correct option. A) K+ ions have the wrong charge. B) The K+ ions are stripped of all their water molecules but the Na+ ions are not. C) Sodium channel admits a Na+ water complex with the water serving as a molecular chaperone through the channel. D) K+ is excluded by voltage gating.
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