Which vessel primarily drains deoxygenated blood from the heart muscle into the right atrium?

Which vessel primarily drains deoxygenated blood from the heart muscle into the right atrium?

• A. Coronary Sinus
• B. Superior Vena Cava
• C. Pulmonary Vein
• D. Aorta

Answer: (A)

The coronary sinus is the vessel that drains deoxygenated blood from the heart muscle into the right atrium. The myocardium’s veins collect venous blood from the heart muscle and funnel it into the coronary sinus, which sits in the posterior part of the coronary sulcus and empties directly into the right atrium. This deoxygenated blood then travels to the lungs for re-oxygenation before cycling back to the heart. In contrast, the superior vena cava collects systemic venous blood from the upper body into the right atrium, the pulmonary veins bring oxygenated blood from the lungs to the left atrium, and the aorta carries oxygenated blood away from the left ventricle to the body.

The coronary sinus is the vessel that drains deoxygenated blood from the heart muscle into the right atrium. The myocardium’s veins collect venous blood from the heart muscle and funnel it into the coronary sinus, which sits in the posterior part of the coronary sulcus and empties directly into the right atrium. This deoxygenated blood then travels to the lungs for re-oxygenation before cycling back to the heart. In contrast, the superior vena cava collects systemic venous blood from the upper body into the right atrium, the pulmonary veins bring oxygenated blood from the lungs to the left atrium, and the aorta carries oxygenated blood away from the left ventricle to the body.