Chapter 8

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Across
  1. 2. Filled with air to speed up transport of respiratory gas in insects
  2. 5. Animals' respiratory structures relate with its ___
  3. 7. Humans have large number of ___ as adaptation to increase TSA/V ratio
  4. 8. Breathing mechanisms in humans and animals involve changes in ___ and volume in respiratory cavity
Down
  1. 1. Most carbon dioxide is transported in the form of ___ in human body
  2. 3. Respiratory surface with fine tubes to allow efficient gaseous exchange
  3. 4. Thin and flat projections in filament in fish
  4. 6. Frogs have thin and ___ skin for efficient gaseous exchange