The circulatory system

                             

Our circulatory system (or cardiovascular system) moves blood through the heart and around our body.

The blood gives our body the oxygen and nutrients it needs. It also carries the waste that we need to eliminate from our body.

The heart is an organ made up of very strong involuntary muscles, so we can't control it. It contracts and relaxes to pump blood through the blood vessels (tubes that conduct blood) in our body

          

There are four parts or chambers in our heart. The atriums receive incoming blood and then send it to the ventricles to be pumped out. The right side of our heart receives oxygen-poor blood from our body and pumps it to the lungs to get cleaned. The left side of your heart receives oxygen-rich blood from the lungs and pumps it back into our body.

There are three types of blood vessels:
- Arteries carry blood and nutrients from the heart to all parts of our body.
- Veins carry blood back to the heart from the rest of our body.
- Capillaries are very small vessels that connect our arteries and veins.

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