Carries materials to and from the cells

• A. Circulatory System
• B. Digestive System
• C. Nervous System
• D. Endocrine System

Answer: (A)

The body uses a transportation network to deliver what cells need and to remove wastes, and that role is filled by the circulatory system. The heart pumps blood through a system of vessels, so every cell can receive oxygen and nutrients and release carbon dioxide and other wastes. Blood also carries hormones and immune cells and helps regulate temperature, all of which involve moving substances to and from cells. The digestive system mainly processes food and absorbs nutrients into the blood, the nervous system moves electrical signals, and the endocrine system releases hormones but relies on the bloodstream to travel to target sites—that transport function is most clearly the job of the circulatory system.