Which body system is responsible for transporting blood and nutrients throughout the body?

• A. Digestive system
• B. Circulatory system
• C. Endocrine system
• D. Lymphatic system

Answer: (B)

The circulatory system is responsible for moving blood and nutrients to every part of the body. It includes the heart, blood vessels, and blood. The heart acts as a pump, pushing blood through arteries to tissues where capillaries exchange oxygen and nutrients for waste products. Blood carried by veins returns to the heart to restart the cycle. Nutrients from digestion enter the bloodstream and are distributed to cells via this system, while waste is carried away for disposal.

Other systems have important roles related to these substances, but they’re not focused on transporting blood and nutrients throughout the body. The digestive system breaks down food and absorbs nutrients, but distribution relies on the circulatory system. The endocrine system uses the blood to circulate hormones, and the lymphatic system helps with fluid balance and immune defense, but neither is primarily about transporting blood and nutrients across the body.