The circulation of blood to and from the heart is as follows
The blood enters the right atrium (RA) of the heart through the superior and inferior vena cava passes through the tricuspid valve (between the right atrium and the right ventricle) to reach the right ventricle (RV). The blood from RV is then pumped through the pulmonary artery to the lungs. In the lungs the oxygenation of the blood occurs and then through the pulmonary vein the oxygenated blood enters the left atrium (LA). The blood then enters the left ventricle (LV) (through the mitral valve) and then pumped through the aorta to the rest of the body. Thus, the correct diagrammatic representation is seen option A.
✨Coronary circulation is the circulation of blood in the blood vessels that supply the heart muscle (myocardium). Coronary arteries supply oxygenated blood to the heart muscle, and cardiac veins drain away the blood once it has been deoxygenated.
✨The superior vena cava (SVC) is the superior of the two venae cavae, the great venous trunks that return deoxygenated blood from the systemic circulation to the right atrium of the heart. It is a large-diameter (24 mm) short length vein that receives venous return from the upper half of the body, above the diaphragm
✨The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. The blood here passes through capillaries adjacent to alveoli and becomes oxygenated as part of the process of respiration.
✨The right atrium receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle which then sends it to the lungs to be oxygenated.