Respiratory System

2. the membrane-lined cavity behind the nose and mouth, connecting them to the esophagus
3. the two large tubes that carry air from your windpipe to your lungs
6. any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange
8. a large, air-filled space above and behind the nose in the middle of the face
9. Hairlike structures called cilia line the mucous membrane and move the particles trapped in the mucus out of the nose
11. the cartilage and bone in your nose
12. hollow spaces within the bones between your eyes, behind your cheekbones, and in your forehead

1. the bronchioles carry air to small sacs in your lungs called alveoli
4. the long tube that connects your larynx (voice box) to your bronchi
5. each of a pair of serous membranes lining the thorax and enveloping the lungs in humans and other mammals
7. a flap of cartilage at the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe
10. the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals; the voice box