EVERYDAY SCIENCE

Detailed explanation-1: -Coronary circulation is the circulation of blood in the arteries and veins that supply the heart muscle (myocardium). Coronary arteries supply oxygenated blood to the heart muscle. Cardiac veins then drain away the blood after it has been deoxygenated.

Detailed explanation-2: -Your heart pumps blood around the body all the time-about five litres (eight pints) of it-and this is called circulation.

Detailed explanation-3: -Coronary vascular flow is best described as phasic flow in that the compressive forces of systole counteract the driving force for flow in the coronary circulation and, therefore, the majority of anterograde blood flow to the left ventricle occurs during diastole (Fig.

Detailed explanation-4: -The coronary arteries arise from the sinuses of Valsalva, just past the origin of the aortic root. The right coronary artery (RCA), arising from the anterior aortic sinus, supplies blood to the right atrium, right ventricle, sinoatrial node, atrioventricular (AV) node, and select portions of the left ventricle.

Detailed explanation-5: -Coronary blood flow occurs mostly during diastole because the coronary vasculature has one particular property: it is compressed by the contracting myocardium such that no flow occurs during systole.