Which of the following is actually a coronary vein, not artery? Left Anterior Descending Coronary Sinus Right Marginal Branch Left Circumflex

The correct answer is Coronary Sinus.<br /><br />The coronary sinus is a large vein located on the posterior side of the heart that collects deoxygenated blood from the myocardium (heart muscle). It is not an artery, which typically carries oxygenated blood away from the heart.<br /><br />The other options listed are coronary arteries:<br /><br />1. Left Anterior Descending (LAD) artery: Supplies oxygenated blood to the front and bottom of the left side of the heart.<br />2. Right Marginal Branch: A branch of the right coronary artery that supplies blood to the right side of the heart.<br />3. Left Circumflex (LCx) artery: Supplies oxygenated blood to the lateral and posterior aspects of the left side of the heart.<br /><br />So, out of the options provided, the coronary sinus is the only one that is a vein, not an artery.