MCAT Question of the Day
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    Q:

    		 Which of the following is true as the membrane potential of a neuron crosses from negative to positive during depolarization in action potential?
    		 

    A

    		 Sodium reverses its direction and begins to flow out of the cell.

    B

    		 Sodium continues to flow into the cell until the voltage has reached a certain positive threshold.

    C

    		 Potassium begins to flow out of the cell.

    D

    		 The sodium-potassium pump ceases to function until the neuron has repolarized.



    Nervous System |
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