PHYSIOLOGY
NEUROTRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Pertaining to the charge of a neuron, which of the following is correct?
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Negatively charged sodium ions rush out of ion channels and positively charged potassium ions rush in.
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Positively charged sodium ions rush out of ion channels and negatively charged potassium ions rush in
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Positively charged sodium ions rush in to ion channels and negatively charged potassium ions rush out.
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None of the above
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Explanation:
Detailed explanation-1: -Remember, sodium has a positive charge, so the neuron becomes more positive and becomes depolarized.
Detailed explanation-2: -Sodium ions (Na+) are attracted to the inside of neurons at rest by two forces. The high concentration of (Na+) outside the cell pushes this ion into the cell down the concentration gradient. Likewise, the electrostatic pressure due to the negative charge within the neuron attracts the positively charged (Na+) inside.
Detailed explanation-3: -A neuron at rest is negatively charged because the inside of a cell is approximately 70 millivolts more negative than the outside (−70 mV); this number varies by neuron type and by species.
There is 1 question to complete.