1. LOWER RESPIRATORY TRACT

2. Is the tract that is responsible for gas exchange.
LOWER RES. TRACT
Is the tract that is responsible for gas exchange.

3. Cartilage block, NOT rings. Lots of muscle.
Secondary Bronchi
Cartilage block, NOT rings.
Lots of muscle.

4. Continued branching (like a tree)
Tertiary Bronchi
Continued branching (like a tree)

6. No cartilage or respiratory epithelium.
Bronchioles
No cartilage or respiratory epithelium.
1 mm in diameter.

10. Difficulty Breathing, bronchioles get constricted.
ASTHMA
Difficulty Breathing, bronchioles get constricted.
Bronchodilator: opens up bronchioles.

11. NORMAL BRONCHI BRONCHI w/ ASTHMA

12. Tiny air sacs, about 150 million per lung.
Alveoli
Tiny air sacs, about 150 million per lung.
Destroyed by smoking, DO NOT regenerate!

13. Very THIN in order to maximize gas exchange.
Alveoli
Very THIN in order to maximize gas exchange.

14. If spread out have the surface area of an entire…
Alveoli
If spread out have the surface area of an entire…

19. Oily secretion that coats alveoli and keep them inflated.
Surfactant
Oily secretion that coats alveoli and keep them inflated.

20. Halves of thoracic cavity, 1 lung in each cavity.
PLEURAL CAVITIES
Halves of thoracic cavity, 1 lung in each cavity.

21. Membrane against ribs and cavity.
Pariatal Pleura
Membrane against ribs and cavity.

22. Membrane around the lungs. (Seal between the two has low pressure)
Visceral Pleura
Membrane around the lungs.
(Seal between the two has low pressure)

24. Inflammation of the membranes, which causes friction.
Pleuritis
Inflammation of the membranes, which causes friction.

26. Collapsed Lung
Lung collapses due to break in the seal, air comes in and lungs shrivel up.
Caused by broken ribs.