PATHOLOGY MCQ
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It sets up a negative charge in the cell = resting potential
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It sets up a positive charge in the cell = action potential
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It causes the signal to pass down the neuron = action potential
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It prevents the neuron from receiving a signal = repolarization
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Detailed explanation-1: -[3][4] The Na+K+-ATPase pump helps to maintain osmotic equilibrium and membrane potential in cells. The sodium and potassium move against the concentration gradients. The Na+ K+-ATPase pump maintains the gradient of a higher concentration of sodium extracellularly and a higher level of potassium intracellularly.
Detailed explanation-2: -How does the sodium-potassium pump contribute to the net negative charge of the interior of the cell? The sodium-potassium pump forces out three (positive) Na+ ions for every two (positive) K+ ions it pumps in, thus the cell loses a positive charge at every cycle of the pump.
Detailed explanation-3: -The sodium-potassium pump moves three sodium ions out of the cell for every two potassium ions it moves into the cell continuously. It, therefore, maintains the large potassium ion gradient across the membrane, which in turn provided the basis for resting membrane potential.