What are the two circuits that make up the circulatory system?

The two circuits that make up the circulatory system are the pulmonary circuit and the systemic circuit.

The pulmonary circuit is responsible for carrying deoxygenated blood from the heart to the lungs, where it picks up oxygen and releases carbon dioxide. This process is crucial for maintaining the body's oxygen levels and is essential for respiration. After the blood is oxygenated, it returns to the heart, ready to be pumped into the systemic circuit.

The systemic circuit, on the other hand, carries oxygen-rich blood away from the heart to the rest of the body. It delivers essential nutrients and oxygen to tissues and organs and collects waste products, returning deoxygenated blood back to the heart.

The other choices do not represent the main circuits of the circulatory system. The coronary circuit specifically refers to the vessels that supply the heart muscle itself, while the lymphatic system is a separate network that is involved in fluid balance and immune function but is not part of the circulatory system as a whole. Therefore, recognizing the distinction between these different components highlights why the pulmonary and systemic circuits are the primary and fundamental components of the circulatory system.