Respiratory system

2. Muscle that helps your lungs pull in air and push it out.
5. Blood vessels in the alveoli walls that move oxygen and carbon dioxide.
8. Tube that delivers air from your mouth and nose to the trachea (windpipe).
9. Two organs that remove oxygen from the air and pass it into your blood.
11. Openings that pull air from outside your body into your respiratory system.
12. Tubes at the bottom of your windpipe that connect into each lung.
15. Hollow organ that allows you to talk and make sounds when air moves in and out.
16. Bones that surround and protect your lungs and heart.

1. Passage connecting your throat and lungs.
3. Thin sacs that surround each lung lobe and separate your lungs from the chest wall.
4. Tissue flap at the entrance to the trachea that closes when you swallow to keep food and liquids out of your airway.
6. Small branches of the bronchial tubes that lead to the alveoli.
7. Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
10. Hollow areas between the bones in your head
13. Tiny hairs that move in a wave-like motion to filter dust and other irritants out of your airways.
14. Sections of the lungs