MCAT Question of the Day
    •

    Q:

    		 Which of the following is true regarding the electrical impulses in the heart?

    		 

    A

    		 The atrioventricular (AV) node initiates the heartbeat.

    B

    		 Purkinje cells in the ventricles control the heart rate.

    C

    		 The sinoatrial (SA) node is located in the left atrium of the heart.

    D

    		 By stimulating the vagus nerve, the parasympathetic nervous system can decrease the rate at which electrical impulses are generated.



    Circulatory System | Nervous System |
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