Across
- 3. mechanical breakdown of food in the mouth
- 6. air sacs in the lungs
- 9. the movement of particles from high concentration to low
- 11. small receiving chambers of the heart
- 13. sinoatrial node
- 15. breaks down carbohydrates in the mouth
- 16. a hormone that increases heart rate
- 17. stomach fluid that breaks down proteins
Down
- 1. contractions of the gut
- 2. large pumping chambers of the heart
- 4. very thin walled blood vessels
- 5. the breakdown of food in the alimentary canal
- 7. upper food tube
- 8. the large intestine
- 10. wind pipe
- 12. voice box
- 14. of the heart