Which circuit sends oxygen-rich blood and nutrients to all body cells?

• A. Pulmonary circuit
• B. Systemic circuit
• C. Coronary circuit
• D. Hepatic circuit

Answer: (B)

The systemic circuit is responsible for delivering oxygen-rich blood and nutrients throughout the entire body. Once blood becomes oxygenated in the lungs via the pulmonary circuit, it returns to the heart. From there, the heart pumps this oxygen-rich blood into the systemic circulation, which branches out to all tissues and organs. This circuit ensures that every cell in the body receives the necessary oxygen and nutrients to perform its functions effectively.

The systemic circuit also plays a vital role in the removal of carbon dioxide and other waste products from the tissues, which are then transported back to the heart and subsequently to the lungs for exhalation. The other circuits mentioned serve more specific functions; for instance, the pulmonary circuit exclusively handles the gas exchange in the lungs, while the coronary circuit supplies blood to the heart muscle itself, and the hepatic circuit relates to the liver and its specific functions.