HUMAN RESPIRATORY SYSTEM

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Across
  1. 5. Blood vessels in the alveoli walls
  2. 6. Location of opening of food pipe and wind pipe
  3. 7. Passage connecting your throat and lungs.
  4. 8. Openings that pull air from outside your body into your respiratory system.
  5. 11. Tissue flap at the entrance to the trachea that closes when you swallow food
  6. 12. Tiny air sacs where exchange of gases takes place.
Down
  1. 1. Tubes at the bottom of your windpipe that connect into each lung.
  2. 2. Muscle that helps your lungs pull in air and push it out.
  3. 3. Hollow organ that allows you to talk and make sounds
  4. 4. Bones that surround and protect your lungs and heart.
  5. 6. Thin outer membrane of lung
  6. 9. Two organs that remove oxygen from the air and pass it into your blood.
  7. 10. Small branches of the bronchial tubes that lead to the alveoli.