Across
- 2. A natural body opening or canal
- 4. Area of blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
- 7. Connects the larynx to the bronchi
- 8. The two opposing layers of serous membrane overlying the lungs and the inside of the surrounding chest walls
- 9. The primary organs of the respiratory system
- 10. Posterior nasal apertures or internal nostrils
- 11. A mass of lymphatic tissue located behind the nasal cavity
Down
- 1. A part of the throat behind the mouth and nasal cavity, and above the esophagus and trachea
- 3. A leaf-shaped flap in the throat that prevents food and water from entering the trachea and the lungs
- 5. Voice box
- 6. Reduces surface tension in alveoli
- 10. A ridge at the base of the trachea (windpipe) that separates the openings of the right and left main bronchi