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