Here's how it works:
* Heart: The heart pumps blood throughout the body.
* Blood Vessels: Blood travels through arteries, veins, and capillaries.
* Blood: Blood carries oxygen, nutrients, hormones, and other essential substances to cells.
* Oxygen: Oxygen is picked up by the blood in the lungs and delivered to cells for energy production.
* Nutrients: Nutrients are absorbed from the digestive system and transported to cells by the blood.
The circulatory system is vital for keeping our cells alive and functioning properly.
