MCAT Question of the Day
    •

    Q:

    		 Which of the following correctly describes the points at which voltage-gated channels open during an action potential?
    		 

    A

    		 Both sodium and potassium voltage-gated channels open when the membrane potential reaches -55 mV.

    B

    		 The voltage-gated sodium channels open when the membrane potential reaches -55 mV and the potassium channels open when the membrane potential reaches 40 mV.

    C

    		 The voltage-gated potassium channels open when the membrane potential reaches -55 mV and the sodium channels open when the membrane potential reaches 40 mV.

    D

    		 Both sodium and potassium voltage-gated channels open when the membrane potential reaches 40 mV.



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