Here's why:
* Blood: The circulatory system uses blood as its transportation medium. Blood carries dissolved nutrients (from digested food), hormones, oxygen, waste products (like carbon dioxide), and other essential substances.
* Heart: The heart acts as a pump, propelling blood throughout the body.
* Blood Vessels: Blood travels through a network of blood vessels, including arteries, veins, and capillaries.
* Arteries: Carry oxygenated blood away from the heart.
* Veins: Carry deoxygenated blood back to the heart.
* Capillaries: Tiny blood vessels that allow for the exchange of substances between the blood and the body's cells.
Let me know if you have any other questions!
