Breathing

3. Main organs of the respiratory system where oxygen and carbon dioxide exchange takes place.
5. Entry point for air into the respiratory system; contains hairs and mucous membranes for filtering.
10. Membrane: Tissue lining the respiratory tract that helps trap and remove particles from the air.
12. Tiny air sacs in the lungs where gas exchange occurs between air and blood.
13. Pressure: Pressure exerted by a specific gas in a mixture of gases.
14. Muscular tube at the back of the throat that serves as a passageway for air and food.
15. Process of breathing in air, involving contraction of the diaphragm and intercostal muscles.
16. Protein in red blood cells that carries oxygen from the lungs to the tissues.
17. Gas essential for cellular respiration and energy production in the body.
19. Dioxide: Waste product of cellular metabolism that is exhaled from the body.
20. Tiny blood vessels where gas exchange occurs between blood and tissues.

1. Small branches of the bronchi that further divide within the lungs.
2. Muscles located between the ribs that assist in breathing.
4. Process of breathing out air, involving relaxation of the diaphragm and intercostal muscles.
6. Act of inhaling and exhaling air; essential for sustaining life.
7. Biological process by which cells obtain oxygen and release carbon dioxide.
8. Dome-shaped muscle beneath the lungs that aids in breathing by expanding and contracting.
9. Two main branches of the trachea that lead into the lungs.
11. Also known as the voice box, it contains the vocal cords and aids in sound production.
18. Also known as the windpipe, it carries air from the larynx to the lungs.