The coronary sinus drains into which chamber?

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Prepare for the Ivy Tech Anatomy and Physiology II (APHY 102) Heart Test with multiple-choice questions, detailed explanations, and study resources. Enhance your understanding and excel in your exam!

Multiple Choice

The coronary sinus drains into which chamber?

Explanation:
The main concept here is where the heart’s venous drainage from the myocardium returns to the heart. Blood from the heart muscle drains into the coronary sinus, which then empties into the right atrium. This places the myocardium’s deoxygenated blood into the chamber that collects systemic venous return before it moves to the right ventricle and onward to the lungs. The coronary sinus does not drain into the right ventricle, left atrium, or left ventricle. For orientation, its ostium is on the posterior wall of the right atrium, near where the inferior vena cava enters.

The main concept here is where the heart’s venous drainage from the myocardium returns to the heart. Blood from the heart muscle drains into the coronary sinus, which then empties into the right atrium. This places the myocardium’s deoxygenated blood into the chamber that collects systemic venous return before it moves to the right ventricle and onward to the lungs. The coronary sinus does not drain into the right ventricle, left atrium, or left ventricle. For orientation, its ostium is on the posterior wall of the right atrium, near where the inferior vena cava enters.

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