BIOLOGICAL BASES OF BEHAVIOR
BIOLOGICAL PSYCHOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Na+ ions continuously leak out of a resting neuron
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Na+ ions are continuously pumped into a resting neuron
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K+ ions continuously leak out of a resting neuron
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K+ ions are continuously pumped out of a resting neuron
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Detailed explanation-1: -What generates the resting membrane potential is the K+ that leaks from the inside of the cell to the outside via leak K+ channels and generates a negative charge in the inside of the membrane vs the outside. At rest, the membrane is impermeable to Na+, as all of the Na+ channels are closed.
Detailed explanation-2: -Accordingly, after a few potassium ions have moved out of the cell, the cell will have an excess of negative charge, whereas the outside solution will have an excess of positive charge; i.e., a potential difference will exist across the membrane.
Detailed explanation-3: -A stimulus from a sensory cell or another neuron causes the target cell to depolarize toward the threshold potential. If the threshold of excitation is reached, all Na+ channels open and the membrane depolarizes. At the peak action potential, K+ channels open and K+ begins to leave the cell.