Respiratory System

5. the membrane that lines the inside of the rib cage, allowing lungs to expand and contract
6. the dome-shaped muscle that separates the thorax from the abdomen, It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
7. passage- either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx It is lined with a mucous membrane that helps keep your nose moist by making mucus, and it contains the olfactory nerves for smelling.
8. either of two external openings of the nasal cavity that admit air to the lungs and smells to the olfactory nerves.
9. one of the many tiny branches from the bronchi; carries air to and from alveoli within the lung
11. the microscopic sacs in which the exchange of gases takes place in the lungs
12. each of the pair of organs situated within the rib cage, consisting of elastic sacs with branching passages into which air is drawn, so that oxygen can pass into the blood and carbon dioxide be removed.
13. an opening surrounded by the lips on the lower part of the face through which food enters the digestive system and from which speech and sounds are emitted.

1. A tube-like portion of the respiratory tract that connects the larynx with the bronchial parts of the lungs. Also known as windpipe.
2. the two branches of the trachea (windpipe); function in carrying air to and from the lungs
3. The hollow tube that is about 5 inches long and starts behind the nose and ends at the top of the trachea (windpipe) and esophagus, also called the throat.
4. a thin, flexible flap in front of the larynx; folds over and blocks the glottis during swallowing
10. the hollow muscular passageway that leads from the pharynx to the trachea (windpipe); the sound-producing organ known as the voice box.