Respiratory & Circulatory System

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Across
  1. 3. breathing, external respiration and gas transport by blood are all examples of
  2. 8. the trachea is made up of c shaped rings made of _
  3. 10. the bronchial tubes _ the air we breath in
  4. 11. what is commonly known as 'the windpipe'
  5. 13. what cells in the trachea trap dirt
  6. 14. letting air into the lungs
Down
  1. 1. small and we have lots of them
  2. 2. _ have thin walls
  3. 3. red blood cells acronym
  4. 4. the organ that warms the air with body temperature
  5. 5. muscle located under the lungs
  6. 6. the process of which a substance moves from high concentration to a low concentration
  7. 7. the top 2 chambers of the heart
  8. 9. letting air out of the lungs
  9. 12. the _ has four chambers