1. LOWER RESPIRATORY TRACT

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

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

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

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

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

11. NORMAL BRONCHI BRONCHI w/ ASTHMA

12. Laser Light Can Detect Potential Diseases Via Breath Samples

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

14. Alveoli  Very THIN in order to maximize gas exchange.

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

20. Surfactant  Oily secretion that coats alveoli and keep them inflated.

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

23. Pariatal Pleura  Membrane against ribs and cavity.

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

27. Pleuritis  Inflammation of the membranes, which causes friction.

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

33. RESPIRATORY PHYSIOLOGY

34. Pulmonary Ventilation  Getting air in and out of lungs.

35. Muscles  Mainly the diaphragm.  External Costals: Outside of ribs, breath in.  Internal costals: Between ribs, breath out.

36. Costals

37. Inspiration  Inhaling or breathing in, 4 basic steps.

38. Inspiration  1. Message to breath sent from the medulla oblongata to breathing muscles.

39. Inspiration  2. Muscles Contract.

40. Inspiration  3. Thoracic cavity gets bigger!

41. Inspiration  4. Air pushes and/or rushes in and fills the lungs.

42. Expiration  Breathing out, consists of 4 basic steps.

43. Expiration  1. Medulla oblongata stops sending message.

44. Expiration  2. Muscles relax.

45. Expiration  3. Thoracic cavity decreases in size, air pressure increases.

46. Expiration  Air is pushed out of the lungs.

49. Cardiopulmonary resuscitation  AKA: CPR  Restores circulation and ventilation.

50. FLEX THE PECS:  Activity time.