MCAT Question of the Day
    •

    Q:

    		 In skeletal muscle contraction, which of the following provides the most important source of calcium ions?
    		 

    A

    		 Triphosphate binding to a receptor on the sarcoplasmic reticulum membrane.

    B

    		 The opening of calcium channels in the sarcoplasmic reticulum.

    C

    		 The calcium ATPase in the sarcoplasm.

    D

    		 Voltage-gated calcium channels in the muscle fiber plasma membrane.



    Protein Structure and Function | Musculoskeletal System | Membrane Transport and Signalling |
    Subscribe


    Is Your Score Stuck?

    We can teach you how to crush the MCAT!

    Learn More