Which statement aligns with the cardiopulmonary system's function?

• A. Blood flow and delivery of O2 and nutrients
• B. Regulation of digestion
• C. Filtration of waste by kidneys
• D. Hormone production

Answer: (A)

The cardiopulmonary system’s function centers on circulating blood to deliver oxygen and nutrients to body tissues, with gas exchange in the lungs supporting that process. The heart pumps oxygenated blood to tissues, and the lungs oxygenate blood and remove carbon dioxide so cells can perform metabolism. This teamwork keeps cells energized and maintains overall perfusion. The other statements point to different body systems—digestion by the GI tract, waste filtration by the kidneys, and hormone production by endocrine glands—so they don’t describe cardiopulmonary activity. Thus, the idea of blood flow delivering O2 and nutrients best aligns with cardiopulmonary function.