Multiple choice

The pacemaker of the heart is situated

  1. in the wall of the left atrium close to the opening to pulmonary veins

  2. in the wall of the right atrium close to the eustachian valve

  3. on interauricular septum

  4. on the interventricular septum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The heart's natural pacemaker is the sinoatrial (SA) node, located in the wall of the right atrium near the opening of the superior vena cava and close to the eustachian valve (valve of the inferior vena cava). It initiates each heartbeat by sending electrical signals.

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