Here's how it works:
* Digestive system: Breaks down food into smaller molecules (nutrients).
* Bloodstream: Nutrients are absorbed into the bloodstream from the digestive system.
* Heart: Pumps the blood throughout the body.
* Blood vessels: Carry the blood with nutrients to all the cells.
So, the circulatory system, powered by the heart, acts like a delivery truck, bringing essential nutrients to every cell in your body.