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Across

2. there are .... types of blood vessels

4. the artery and the veins are conected with.....

7. the heart pumps blood into the....

8. when dthe heart contracts, blood is pushed under high....

9. humans have a ............. system

10. the heart and all the blood vessels together form the?

Down

1. if the blood passes a organ twise it is called a

3. the ..... side of the heart pumps blood into both lungs

5. many neins have.....

6. the blood passes ... ..... twice during one sircuit of the body

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