Which of the following are the four main chambers of the heart?

The four main chambers of the heart are the right atrium, right ventricle, left atrium, and left ventricle. Each of these chambers plays a vital role in the cardiac cycle and the overall function of the heart in circulating blood throughout the body.

The right atrium receives deoxygenated blood from the body via the superior and inferior vena cavae and pumps it into the right ventricle. The right ventricle then sends this blood to the lungs through the pulmonary artery for oxygenation. On the left side, the left atrium receives oxygen-rich blood from the lungs via the pulmonary veins and passes it into the left ventricle. Finally, the left ventricle pumps this oxygenated blood throughout the body via the aorta.

Understanding the structure and function of these chambers is essential for grasping how blood circulation operates. The other options do not accurately represent the correct chambers. For instance, including coronary arteries, the right atrial septum, or structures like the aorta and pulmonary veins distracts from identifying the primary chambers responsible for the heart's pumping action.