What are the two primary circulation systems of the heart?

The two primary circulation systems of the heart are the systemic and pulmonary systems. The systemic circulation is responsible for delivering oxygenated blood from the heart to the rest of the body and returning deoxygenated blood back to the heart. This system ensures that organs and tissues receive the necessary nutrients and oxygen to function properly.

In contrast, the pulmonary circulation involves transporting deoxygenated blood from the heart to the lungs, where carbon dioxide is exchanged for oxygen. Once the blood is oxygenated in the lungs, it returns to the heart to be pumped out to the body again through the systemic circuit.

While options such as coronary circulation are essential for supplying blood to the heart muscle itself, it is a subset of systemic circulation and not one of the primary circulation systems. The lymphatic system, mentioned in another option, plays a role in fluid balance and immune function but does not function as a primary circulation pathway like the systemic and pulmonary systems do.