Across
- 7. main heart muscle
- 8. Your heart keeps your blood ___.
- 9. Our blood carries ___ to the rest of the body.
- 10. Is like a door
- 12. A heart can beat faster if you are excited or __.
- 14. when the heart squeezes and relaxes once
- 15. Your heart is close to the size of a ___.
Down
- 1. The heart beats ____of times in your life.
- 2. cycle the time for one heartbeat
- 3. another word for spaces in the heart
- 4. Cells need ____ to live.
- 5. The heart beats about 70 to 80 times a ____.
- 6. The brain makes the heart beat faster or ____.
- 11. heart chambers that move blood out of heart
- 13. a heart chamber that takes in blood from veins