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Emsga Emsga
wrote...
Posts: 761
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6 years ago
Where does the impulse for cardiac contraction originate?
 
  a. Superior vena cava
  b. Inferior vena cava
  c. Sinoatrial (SA) node
  d. Vagus nerve
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wrote...
6 years ago
ANS: C
Muscular contractions of the atria and ventricles are controlled by an electrical impulse that originates in the sinoatrial (SA) node.
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