Respiratory System

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Across
  1. 3. Muscle between the lungs and stomach that is used when you breathe.
  2. 4. The inhaling of oxygen and exhaling of carbon dioxide.
  3. 6. Breathing organs located in the chest cavity.
  4. 7. To breathe in.
  5. 8. The process of taking air into the lungs and then releasing it.
  6. 9. A waste gas that leaves our bodies when we exhale is ____________ dioxide.
Down
  1. 1. To breathe out.
  2. 2. Tiny hairs that protect the respiratory tract from dust and other particles.
  3. 5. The organs involved in breathing is the ____________ system.