Human respiratory system

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Across
  1. 2. what is known as soundbox
  2. 4. Hollow areas between the bones in your head that help regulate the temperature
  3. 6. Muscle that helps your lungs pull in air and push it out.
  4. 8. Bones that surround and protect your lungs and heart.
  5. 9. Passage connecting your throat and lungs.
  6. 11. Two organs that remove oxygen from the air and pass it into your blood.
Down
  1. 1. which is lined with hair and mucus to filter the air from dust and dirt.
  2. 3. A small flap of tissue that protects the larynx
  3. 5. the airtight box that houses the bronchial tree, lungs, heart, and other structures.
  4. 7. Tube that delivers air from your mouth and nose to the trachea
  5. 10. Tiny hairs in the nose