Multiple choice

The pacemaker of the heart is

  1. sinoatrial (SA) node

  2. atrioventricular (AV) node

  3. purkinje fibers

  4. venae cavae

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A Correct answer
Explanation

The sinoatrial (SA) node is a section of nodal tissue that is located in the upper wall of the right atrium. The SA node is also referred to as the pacemaker of the heart.