Across
- 3. The upper part of the trachea, containing the vocal cords
- 7. A group of organs that work together to perform a function
- 12. A thin band of muscle between two ribs that helps with breathing
- 13. The process used by all living cells to release energy
- 16. Tubes which branch out from the bronchi like tree roots and carry air to and from the alveoli.
- 17. A large sheet of muscle that contracts to draw gas into the lungs
Down
- 1. A gas needed by cells so that they can carry out respiration
- 2. A tiny air sac in a lung where gas exchange occurs
- 4. The movement of oxygen into the blood and carbon dioxide out of it
- 5. The movement of air into and out of the lungs
- 6. A flap of cartilage that stops food entering the trachea
- 8. A gas produced as waste when cells release energy
- 9. A tiny blood vessel where substances pass to and from the blood
- 10. The main airway between the throat and the lungs
- 11. The movement of molecules from an area of high to low concentration
- 14. The common pathway for air and food
- 15. An organ where gas exchange occurs between air and blood