The circulatory system (also called the cardiovascular system) is the body’s transport system. It
moves blood around your body to deliver what your cells need and remove waste.
� Main parts:
1. Heart
A strong muscle that pumps blood nonstop.
2. Blood
The fluid that carries:
o
Oxygen
o
Nutrients (like glucose)
o
Waste (like carbon dioxide)
3. Blood vessels
Tubes that carry blood:
o
Arteries → carry blood away from the heart
o
Veins → carry blood back to the heart
o
Capillaries → tiny vessels where exchange happens
🔄 How it works:
1. The heart pumps oxygen-rich blood to the body.
2. Cells use the oxygen and nutrients.
3. Blood picks up waste like carbon dioxide.
4. The blood returns to the heart.
5. It goes to the lungs to get oxygen again.
💡 Simple way to remember:

Heart = pump

Blood = delivery truck

Blood vessels = roads
❤️ Why it’s important:

Keeps cells alive

Gives energy to your body

Removes harmful waste