Across
- 5. - The primary muscle used to breathe
- 6. - The tube that food is meant to go down
- 8. - The passageway for air from your nose and mouth to your lungs
- 10. - The lower areas of the heart are called...
- 12. - This is where gas exchange takes place at in the lungs
- 13. - The valve that connects the left atrium and ventricle
- 16. - The largest blood vessel in the body is the...
- 17. - Arteries and veins that carry CO2-rich blood are called...
- 18. - Cavities in the face that produce mucus to protect against infection
- 19. - The upper areas of the heart are called...
Down
- 1. - The main organ of the respiratory system
- 2. - Where the vocal cords are
- 3. - Tiny blood vessels
- 4. - Carries blood to the heart
- 7. - Carries blood away from the heart
- 9. - the main organ in the circulatory system
- 11. - Leaf-shaped structure that closes the glottis
- 14. - Keeps food from going down the trachea when eating
- 15. - The walls of the heart
- 16. - The valve that carries blood to the aorta is called...