PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid:
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Calcium
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Sodium
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Chloride
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Potassium
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Explanation:
Detailed explanation-1: -After an action potential potassium ions rapidly diffuse out of the cell into the tissue fluid. An action potential occurs when a nerve impulse is sent from a cell body where the sodium channel in the cell membrane opens and the positive sodium ions surge into the cell.
Detailed explanation-2: -A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron.
Detailed explanation-3: -At each node, the membrane depolarizes above the threshold voltage, and the influx of sodium ions again initiates the action potential through Nav.
There is 1 question to complete.