Question

The sinoatrial node (SAN) is present on the upper right corner of the right atrium and the atrioventricular node (AVN) is present at the lower-left corner of the right atrium
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Answer 1

Explanation:

The ocean is a huge body of saltwater that covers about 71 percent of Earth's surface. The planet has one global ocean, though oceanographers and the countries of the world have traditionally divided it into four distinct regions: the Pacific, Atlantic, Indian, and Arctic oceans.

Answer 2

Explanation:

The sinoatrial node is present at the right upper corner of the right atrium. The node is present below the Vena Cava. It initiates the autonomous contraction of the heart muscles.