Respiratory system

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Across
  1. 1. the trachea divides into 2 tubes called ___ leading to the lungs. ( Starts with B)
  2. 6. Common passage for food and air. ( Starts with P)
  3. 8. A Muscular flap that prevents the food from entering the windpipe. ( Starts with E )
  4. 10. The pair of bones which protects the lungs is ___. ( Starts with R )
Down
  1. 2. What is the name of gas we breathe in? ( Starts with O)
  2. 3. The hair-like structure in your nasal passageways is ___. ( Starts with C)
  3. 4. A muscle that is under the lungs and separates the abdomen from the chest. (Starts with D)
  4. 5. When cellular respiration uses oxygen it is called ___ respiration. ( Starts with A)
  5. 7. Gas exchange in the lungs happens in the ___. ( Starts with A)
  6. 9. A pair of spongy organs. (Starts with L)