The human body

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Across
  1. 2. the part of the body that makes the blood go around inside
  2. 6. the lungs are located here
  3. 7. a rhythmical throbbing of the arteries as blood goes through them, typically as felt in the wrists or neck
  4. 8. the muscle between your lungs and your stomach that helps you to breathe
  5. 9. the two parts inside your body that you use for breathing
  6. 10. when you breathe in
  7. 11. the lungs are protected by this
  8. 13. another word for breathing
  9. 14. a group of things or parts that work together
Down
  1. 1. when you breathe out
  2. 3. tiny air sacs in lungs
  3. 4. the name of the air you breathe in
  4. 5. the smallest tubes in the body that carry blood
  5. 6. windpipe
  6. 12. the red liquid inside your body