The circulatory system’s main job is to move blood around the body. That blood brings cells what they need and takes away what they don’t.
Main functions
- It delivers oxygen from the lungs and nutrients from digested food to all the cells so they can make energy, grow, and repair.
- It removes waste products like carbon dioxide from cells and carries them to organs such as the lungs and kidneys so the body can get rid of them.
What it includes
- It is made of the heart (the pump), the blood (the fluid), and the blood vessels (the tubes that carry the blood).
- Arteries carry blood away from the heart, veins bring blood back to the heart, and tiny capillaries allow exchange of oxygen, nutrients, and wastes between blood and body cells.
