2. Ch. 3 Lesson 2 What is the respiratory system?

3. respiratory system: Carries gases between outside air & blood Many parts coated w/ mucus= sticky, thick fluid that traps dust, germs & other things in air

4. trachea tube that carries air from larynx  lungs leads to 2 branches (bronchi)  goes in lungs

5. bronchioles small tubes in lungs

6. larynx vocal cords stretch across larynx voice= vocal cords vibrate

7. air sacs (alveoli) thin walled pouches in lungs oxygen enters blood & carbon dioxide leaves thru. capillaries capillary

8. diaphragm dome shaped muscle that forms bottom of chest inhale (breathe in)- moves exhale (breathe out)- moves

9. cilia Tiny, hairlike structures on cells in linings of many parts of respiratory system

10. Scanning electron microscope image of lung cilia

11. nose mouth larynx pharynx trachea lungs bronchi bronchioles alveoli (air sacs) diaphragm

12. When you hold your breath, carbon dioxide builds in your blood. Your brain senses this & sends a message to the diaphragm and rib muscles telling them to breathe.

13. Respiratory System

15. Are vocal cords located inside your larynx, trachea, or esophagus?

16. The vocal cords are located inside your larynx.

17. When you inhale, which direction does your diaphragm move?

18. The diaphragm pulls downward.

19. nose mouth larynx pharynx trachea lungs bronchi bronchioles alveoli (air sacs) diaphragm

20. cilia Tiny, hairlike structures on cells in linings of many parts of respiratory system

21. trachea Tube that carries air from larynx  lungs Leads to 2 branches (bronchi)  lungs

22. bronchioles Small tubes in lungs

23. exhale breathe out

24. respiratory system: Carries gases between outside air & blood Many parts coated w/ _________ sticky, thick fluid that traps dust, germs & other things in air mucus

25. diaphragm dome shaped muscle that forms bottom of chest

26. inhale breathe in