EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In resting potential, neurons have more ____ on the outside of the cell membrane.
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K+
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NaCl
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Na+
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Cl-
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Explanation:
Detailed explanation-1: -A neuron at rest is negatively charged: the inside of a cell is approximately 70 millivolts more negative than the outside (−70 mV, note that this number varies by neuron type and by species).
Detailed explanation-2: -The sodium and chloride ion concentrations are lower inside the cell than outside, and the potassium concentration is greater inside the cell. These concentration differences for sodium and potassium are due to the action of a membrane active transport system which pumps sodium out of the cell and potassium into it.
Detailed explanation-3: -The inside of the cell has a low concentration of sodium ions, and the outside of the cell has a higher concentration of sodium ions.
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