Across
- 2. Main breathing muscle that contracts to pull air into the lungs.
- 5. One of the two main tubes that enters each lung from the trachea.
- 9. Nerve that helps control breathing with an input from the receptors.
- 10. Nerve that controls the diaphragm.
- 11. Muscles between the ribs that help expand the chest during breathing.
- 12. “Voice box” that connects the pharynx to the trachea.
- 13. Small branching airways inside the lungs that lead to alveoli.
Down
- 1. Sensors that detect CO₂, O₂, and pH levels in the blood.
- 3. Throat region that connects the nose/mouth to the larynx and esophagus.
- 4. Tiny air sac where gas exchange happens (O₂ in, CO₂ out).
- 6. Windpipe that carries air from the larynx to the lungs.
- 7. Sensors in the lungs that detect inflation to prevent overexpansion.
- 8. Substance that reduces surface tension to keep alveoli from collapsing.