The Respiratory System

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Across
  1. 3. / This muscle sits under our lungs and contracts and releases to help our lungs breathe.
  2. 5. / The large tube that connects our mouth and nasal cavity to our lungs is called our _______.
  3. 7. / Breathing is controlled by our _______ Nervous System, which means we don't have to think about it!
  4. 8. / The small sacs of air in our lungs are called _______.
  5. 10. / This is the word for taking air into the lungs.
  6. 11. / The tiny branch-like tubes in our lungs are called _______.
  7. 12. / These thin blood vessels carry blood cells to our lungs.
  8. 13. / This is the word for pushing air out of the lungs.
Down
  1. 1. / When we breathe in, our muscles contract and our ribs move outward, which creates more volume in our chest and decreases the _______ inside. This difference between the inside of our chest and the environment around us causes air to be pulled into the lungs.
  2. 2. / This process makes the higher concentration of oxygen in our lungs move into the oxygen-deprived blood cells, and vice versa for the carbon dioxide moving from the cells to the lungs to be exhaled.
  3. 4. / Oxygen from our breath attaches to this protein in our red blood cells and is carried away to the rest of the body.
  4. 6. / When we exhale, we release _______ _______.
  5. 9. / These are the organs we breathe with!
  6. 14. / When we breathe, we take in _______.