Answer :

Right atrium and apex of the heart. the right atrium is a chamber located in the upper right portion of the heart. It receives deoxygenated blood from the body through the superior and inferior vena cava, and then pumps it into the right ventricle.

The right atrium plays a crucial role in the circulation of blood by receiving the returning blood and preparing it for oxygenation.

The apex of the heart refers to the pointed, bottom portion of the heart. It is formed by the left ventricle and is positioned slightly to the left of the midline of the chest. The apex is responsible for generating the forceful contractions required to pump oxygenated blood throughout the body.

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