Respiratory System

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Across
  1. 2. the gas moved to the lungs from all living cells
  2. 5. (5/5/7)these contract and relax during breathing
  3. 7. main air pipe
Down
  1. 1. common livestock disease of the lungs
  2. 3. these have very large surface area for gaseous exchange
  3. 4. passage this warms and cleans the air coming into the livestock
  4. 6. maximum breathing rate of a healthy adult cow