The Respiratory System

1234567
Across
  1. 2. Tiny air sac in an organ of the respiratory system.
  2. 6. A open space above and behind your nose full of air.
  3. 7. Breathing out air instead of breathing it in.
Down
  1. 1. Connects to tiny air sacs in an organ in the chest.
  2. 3. An organ on either side of your chest.
  3. 4. A long muscle that connects from your nose to your lungs.
  4. 5. A skeletal muscle that separates your waist and chest.