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

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

Answer: (B)

Transport of blood and nutrients through the body is carried out by the circulatory system. This system includes the heart, which acts as a pump, and a vast network of blood vessels that move blood to every tissue. Blood carries nutrients absorbed from the digestive system to cells and helps remove wastes like carbon dioxide. The digestive system digests food and absorbs nutrients, but it’s the circulatory system that distributes those nutrients throughout the body. The endocrine system also uses blood to move hormones, but its main role isn’t transporting blood and nutrients itself. The lymphatic system returns excess fluid and fats to the bloodstream and supports immunity, but it doesn’t provide the primary means of circulating blood everywhere. Therefore, the circulatory system is the primary transport system for blood and nutrients.