NEET PG DENTAL EXAM

Detailed explanation-1: -The upper chambers, the right and left atria, receive incoming blood. The lower chambers, the more muscular right and left ventricles, pump blood out of the heart.

Detailed explanation-2: -The sinuatrial node, which is responsible for regulating the automaticity of the myocardium, is located in the posterior wall of the right atrium. More specifically, it is inferolateral to the opening of the superior vena cava, along the superior part of the crista terminalis.

Detailed explanation-3: -The heart has four chambers: two atria and two ventricles. The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle. The right ventricle pumps the oxygen-poor blood to the lungs. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.