Respiratory System

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Across
  1. 3. Holes on insect's thorax used for gas exchange
  2. 5. Axolotls, tadpoles and daphnias have ____ gills.
  3. 7. Amphibians lower the floor of their mouths to inhale and exhale air. This is known as ____ pumping.
  4. 9. The movement of water across gills to take in oxygen and into the blood via a ____ current.
  5. 11. One place the mammal body takes in oxygen
  6. 12. These animals have no true diaphragm and intstead move their mouths.
Down
  1. 1. Key organs involved in gas-exchange in mammals and birds
  2. 2. Epithelium covering the gills on a fish
  3. 4. Gas expelled from the body during respiration
  4. 5. Respiration is the body's process of gas ______.
  5. 6. Another term for the windpipe
  6. 8. Muscles found on mammals used to inhale and exhale.
  7. 10. Gas taken into the body during respiration