The Structure and Physiology of the Heart

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