Respiratory System

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Across
  1. 3. This muscle contracts and relaxes as we breathe in and out
  2. 5. Inhaled air enters the body through it
  3. 6. Air can be inhaled through it when nose is blocked
Down
  1. 1. The tube that carries air to and from the bronchus
  2. 2. These tubes branch out like "trees" to carry air into the lungs
  3. 4. They take in air and supply fresh oxygen to the red blood cells