Here's how it works:
* Digestive system: Breaks down food into smaller molecules that the body can absorb.
* Circulatory system: The blood, which is part of the circulatory system, picks up these nutrients from the digestive system.
* Blood vessels: Blood travels throughout the body through a network of blood vessels.
* Cells: Nutrients are delivered to individual cells through tiny blood vessels called capillaries.
The circulatory system also carries away waste products from the cells, and helps regulate body temperature.
