Multiple Choice
Which of the following statements is true?
45. Nervous System
Neurons and Action Potentials
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A drug that causes potassium to leak out of a neuron, increasing the positive charge on the outside, would __________.
A
make it easier to trigger action potentials in the neuron
B
cause the cell to release its neurotransmitter
C
speed up nerve signals traveling the length of the cell
D
act as a stimulant
E
inhibit transmission of nerve signals by the neuron
Verified step by step guidance1
Understand the role of potassium ions in neuron function: Potassium ions (K⁺) are crucial for maintaining the resting membrane potential of neurons. They are typically more concentrated inside the neuron than outside.
Consider the effect of potassium leaking out: If potassium leaks out of the neuron, it increases the positive charge outside the neuron, making the inside relatively more negative.
Relate this change to action potentials: Action potentials are triggered when the inside of the neuron becomes less negative (depolarization). Increased positive charge outside makes it harder for depolarization to occur.
Analyze the impact on nerve signal transmission: If depolarization is inhibited, it becomes difficult for action potentials to propagate, thus inhibiting nerve signal transmission.
Conclude the effect of the drug: The drug would inhibit transmission of nerve signals by the neuron, as the increased positive charge outside prevents the necessary depolarization for action potentials.
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