The Respiratory System

2. The part of the face that bears the nostrils and covers the anterior part of the nasal cavity.
5. A muscular tube that connects the nasal cavity and mouth to the esophagus and trachea.
6. Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood.
7. The two main branches of the trachea that lead into the lungs.
9. The pair of organs in the chest that help oxygen enter the body and remove carbon dioxide.
10. A tube that connects the throat to the lungs, also known as the windpipe.
11. A gas that is essential for life and is used by the body to create energy.

1. The system in the body responsible for breathing and exchanging gases between the body and the environment.
2. The space inside the nose that filters, warms, and moistens air as it is breathed in.
3. A dividing wall or membrane especially between bodily spaces or masses of soft tissue.
4. A dome-shaped muscle beneath the lungs that helps with breathing by contracting and relaxing.
7. Small tubes in the lungs that branch off from the bronchi and connect to the alveoli.
8. A waste gas produced by the body that is exhaled through the respiratory system.