1. The Respiratory System for student copy

2. Functions of the Respiratory System Gas Exchange

3. Organs of the Respiratory System Upper Respiratory Tract – Nose – Pharynx – Larynx Lower Respiratory Tract – Trachea – Bronchi – Lungs

4. Nose framework composed of bone & cartilage 2 nostrils called: external nares – where air enters the nasal cavity – rt & lt separated by nasal septum site of nose bleeds @ internal edge: internal nares

5. Pharynx throat 3 divisions: 1.Nasopharynx – begins @ internal nares  end of soft palate 2.Oropharynx – edge of soft palate  hyoid bone 3.Laryngopharynx – hyoid bone  upper edge of esophagus

6. 3 Parts of the Pharynx

7. Larynx “voice box” Cartilage Parts: – Epiglottis – Glottis – Thyroid cartilage – Cricoid cartilage

8. Larynx moves upward when you swallow  – tips epiglottis over the glottis (opening of trachea) – allows food  esophagus (--/  down trachea to lungs) – if not swallowing: glottis is open allowing air  lungs – http://www.linkstudio.info/images/portfolio/medani/Swall ow.swf http://www.linkstudio.info/images/portfolio/medani/Swall ow.swf

9. Trachea rings of cartilage maintain its shape to prevent it from closing forks into 2 bronchi

10. Bronchus each enters a lung where it branches into smaller & smaller bronchioles resembling an inverted tree

11. Bronchioles fine tubes that allow passage of air smooth muscle surrounds them  when contracts airways constrict epithelium covered with cilia & mucus mucus traps dust, particulates cilia beat upward removing trapped particles from airways (moves particles ~1-3 cm/hr)

12. Bronchioles

13. Gas Exchange in Lungs

14. Pulmonary Function Tests “PFTs” subject breathes into a closed system in which air is trapped w/in a bell floating in water bell moves up when patient exhales / down when they inhale

15. Pulmonary Function Tests Tidal Volume: – amt of air expired Vital Capacity: – max amt of air that can forcefully exhaled after a max inhalation

16. Spirogram

17. Anatomical Dead Space not all inspired air will get into the lungs exhaling does not force all air out of the body

25. Hemoglobin helps transport oxygen, carbon dioxide, & buffer blood as carbon dioxide leaves cells & diffuses thru interstial fluid then into capillary it combines with water to form carbonic acid

27. Hgb Loading & Unloading Oxygen

28. Respiratory pH Balance

29. Respiratory Acidosis hypoventilation accumulation of CO 2 in tissues pH decreases plasma HCO 3- increases

30. Respiratory Alkalosis hyperventilation excessive loss of CO 2 pH increases plasma HCO 3- decreases CO2 in blood increases