Blood returning from the systemic circuit enters which heart chamber?

Blood returning from the systemic circuit enters which heart chamber?

• A. Left atrium
• B. Right atrium
• C. Left ventricle
• D. Right ventricle

Answer: (B)

Blood returning from the systemic circuit goes back to the heart and enters the right atrium. This chamber receives deoxygenated blood via the superior and inferior vena cavae and the coronary sinus, bringing in blood from the body. From there, the blood moves to the right ventricle through the tricuspid valve and is then sent to the lungs for oxygenation. The left atrium, in contrast, collects oxygenated blood from the lungs via the pulmonary veins. This arrangement keeps systemic return routed to the right side of the heart.

Blood returning from the systemic circuit goes back to the heart and enters the right atrium. This chamber receives deoxygenated blood via the superior and inferior vena cavae and the coronary sinus, bringing in blood from the body. From there, the blood moves to the right ventricle through the tricuspid valve and is then sent to the lungs for oxygenation. The left atrium, in contrast, collects oxygenated blood from the lungs via the pulmonary veins. This arrangement keeps systemic return routed to the right side of the heart.