Which of the following is required for the secretion of neurotransmitters in res

Question

Which of the following is required for the secretion of neurotransmitters in response to an action potential? (a) neurotransmitter receptors (b) Na^+ - K^+ pumps (c) voltage-gated Ca2^+ channels (d) voltage-gated K channels Which of the following is NOT true about an action potential? (a) They are self-propagating and amplifying. (b) The initial stimulus must be below the threshold level. (c) They result in depolarization of the cell. (d) They only move in one direction down an axon. Which of the following would inhibit a cell from firing an action potential? (a) Opening of Cl^- channels (b) Inactivation of K^+ leak channels (c) Binding of acetylcholine (d) Opening of Ca^2+ channels Suppose that a disorder caused an increase in Na^+ in the extracellular fluid surrounding your neurons. What effect if any would this have on the neuron? (a) It would be more likely to fire an action potential. (b) It would have a more positive action potential peak. (c) It would

Explanation / Answer

1 - Answer is C

Voltage gated Ca2+ channels are required for release of neurotransmitters in response to action potential.

2 - Answer is A

Action potential is not self propagating and amplifying. They need external stimuli for initiation.

3 - Answer is B

Inhibition of K+ leak channels lead to inhibition of cell from firing an action potential.

4 - Answer is D

There would be no effect, because Na+ channels open only if there is a action potential.

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