Across
- 5. a muscular organ that pumps blood
- 6. the air sacs at the end of the bronchioles where the gas exchange takes place
- 8. connect arteries and veins
- 9. carries blood and nutrients away from the heart
- 10. carries blood and nutrients to the heart
Down
- 1. hollow tube that connects the larynx to the right and left bronchus
- 2. control the flow of blood by opening and closing
- 3. the two major air passageways leading from the trachea to the lungs
- 4. a flap of elastic cartilage attached to the larynx that closes when food passes
- 7. hollow muscular organ which holds the vocal cords