The process by which blood circulates through the heart, involving the right atrium, right ventricle, left atrium, and left ventricle, is called what?

• A. Cardiac cycle
• B. Blood flow through the heart
• C. Pulmonary circulation
• D. Systemic circulation

Answer: (B)

The movement of blood through the heart from the right atrium, through the right ventricle, then the left atrium, to the left ventricle, and onward back to the body and lungs is best described as blood flow through the heart. This term directly reflects the actual path blood takes as it passes through each chamber and valve during circulation. The cardiac cycle, while related, names the sequence of heart muscle contractions and relaxations (systole and diastole) rather than the route of blood through the chambers. Pulmonary circulation and systemic circulation describe where blood goes after leaving the heart (to the lungs or to the body), not the intracardiac flow itself.