Question

What is coronary circulation?

Answer 1

Hint: The coronary arteries emerge from the Valsalva sinuses, right past the aortic root's origin. The right coronary artery (RCA) is a blood vessel that originates in the anterior aortic sinus and feeds blood to the right atrium, right ventricle, sinoatrial node, atrioventricular (AV) node, and select areas of the left ventricle. The left coronary artery (LCA) originates in the left posterior aortic sinus and divides into the left circumflex artery (LCX) and the left anterior descending artery (LAD), which feed blood to the left atrium and left ventricle, respectively.

Complete answer:
Coronary circulation is a branch of the systemic circulatory system that feeds blood to and drains the heart's tissues. Two coronary arteries branch off the aorta slightly beyond the semilunar valves in the human heart; during diastole, increasing aortic pressure above the valves pulls blood into the coronary arteries, and subsequently into the heart's musculature. Coronary veins return deoxygenated blood to the heart chambers; the majority of them converge to form the coronary venous sinus, which empties into the right atrium.
The heart collects 70 to 75 percent of the available oxygen from the blood in coronary circulation, which is significantly more than the amount extracted by other organs from their circulations—for example, 40 percent by resting skeletal muscle and 20% by the liver. In severe situations, occlusion of a coronary artery, which deprives the heart tissue of oxygen-rich blood, results in the death of a portion of the heart muscle (myocardial infarction), as well as total heart failure and death.
The circulation of blood in the blood arteries that supply the heart muscle is known as coronary circulation (myocardium). Coronary arteries carry oxygenated blood to the heart muscle, whereas cardiac veins return deoxygenated blood to the body. The heart is required to perform constantly because the rest of the body, particularly the brain, requires a constant supply of oxygenated blood that is free of all but the tiniest disruptions. As a result, its circulation is critical not only to its own tissues but also to the entire body and even the brain's degree of consciousness from moment to moment.

Note:-
Interruptions of coronary circulation quickly cause heart attacks (myocardial infarctions), in which the heart muscle is damaged by oxygen starvation. At rest, approximately 60% to 70% of oxygen is extracted from blood in the coronary arteries. In the 1960s, adenosine was a proposed possible metabolite responsible for triggering coronary vasodilation.