MCAT Question of the Day
    •

    Q:

    		 Muscle cells rely on changes in membrane potential in order to initiate contraction. Which of the following is incorrect regarding muscle cells and their membrane potential dynamics?
    		 

    A

    		 Depolarization of the muscle membrane results in an influx of calcium

    B

    		 Contraction is induced directly by calcium influx from outside the cell as well as efflux from the sarcoplasmic reticulum

    C

    		 Efflux of calcium ions from the sarcoplasmic reticulum initiates hyperpolarization of the cell, resulting in the contraction of the cell

    D

    		 Muscle contraction is an active process



    Membrane Transport and Signalling | Musculoskeletal System |
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