The role of sodium-potassium pump (embedded in the neurilemma), during the propagation of nerve impulse is to
Correct answer: B. Maintain long-term resting potential
- A. Stimulate depolarization
- B. Maintain long-term resting potential
- C. Trigger the release of neurotransmitter
- D. Propagate electric signals in one direction
Explanation
The correct answer is Option B:maintain long-term resting potential.The sodium-potassium pump is crucial for maintaining the resting membrane potential of neurons. It actively transports sodium (Na+) ions out of the cell and potassium (K+) ions into the cell, creating and maintaining the necessary ionic gradient for depolarization and propagation of nerve impulses. Option A is incorrect because the pump does not directly stimulate depolarization; it prepares the neuron for it. Option C is incorrect because neurotransmitter release is triggered by calcium ion influx, not the pump. Option D is incorrect because the directionality of signal propagation is due to the refractory period, rather than the pump.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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