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Title: Where does the impulse for cardiac contraction originate? Post by: Emsga on Feb 10, 2018 Where does the impulse for cardiac contraction originate?
a. Superior vena cava b. Inferior vena cava c. Sinoatrial (SA) node d. Vagus nerve Title: Where does the impulse for cardiac contraction originate? Post by: russinhacker on Feb 10, 2018 ANS: C
Muscular contractions of the atria and ventricles are controlled by an electrical impulse that originates in the sinoatrial (SA) node. |