Here's how it works:
* Blood: The circulatory system uses blood as its transport medium. Blood carries nutrients, oxygen, hormones, and other essential substances to cells throughout the body. It also removes waste products, like carbon dioxide.
* Blood Vessels: Blood travels through a network of blood vessels:
* Arteries: Carry oxygenated blood away from the heart.
* Veins: Carry deoxygenated blood back to the heart.
* Capillaries: Tiny vessels that connect arteries and veins, allowing for exchange of materials between blood and cells.
* Heart: The heart acts as a pump, pushing blood through the vessels.
So, the circulatory system is a vital network that keeps cells functioning by delivering what they need and removing what they don't.
