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