Respiratory system
Across
- 4. a muscle sheet underneath the lungs that contract when you inhale
- 6. The volume of the lungs would be increase when we inhale
- 8. a structure in the pharynx which prevent the food entering the trachea
- 9. air sac must be thin, large surface area , and __________ to allow efficient gas exchange
- 10. The ribcage contract and moves __________ when we exhale
Down
- 1. a site of gas exchange
- 2. The volume of the air which remain in the lungs after expiration
- 3. a blood which contain more oxygen than carbon dioxide
- 5. a cell which produce a mucus
- 7. a tiny small hair like structure which always swept away mucus toward the throat