Answer :
Blood returning to the heart from the systematic circuit first enters the right atrium.
Blood returning to the heart from the systemic circuit first enters the right atrium.
Systemic circulation
The heart is a hollow organ the helps in the pumping and distribution of blood to the lungs and the whole body cells.
The blood the passes through the heart occurs in two way:
- Systemic circulation and
- Pulmonary circulation
Systemic circulation is the distribution of blood from the heart to the whole body and back to the heart.
The returning blood first enters the right atrium from the inferior and superior Vena Cava.
The opening of the tricuspid valve allows the movement of blood to the right ventricle which then pumps it to the lungs.
Therefore, blood returning to the heart from the systemic circuit first enters the right atrium.
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