MCAT Question of the Day
    •

    Q:

    		 Passive diffusion across the membrane of axons involves ion flow in which directions?
    		 

    A

    		 Sodium ions in and potassium ions out.

    B

    		 Sodium and potassium ions in.

    C

    		 Sodium and potassium ions out.

    D

    		 Sodium ions out and potassium ions in.



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