1. The Respiratory
System

2. Purpose of the respiratory
system
• To provide a constant supply of oxygen
to keep your body cells functioning
• To remove carbon dioxide from the
body cells

3. Organs of the respiratory system
• Nose / mouth • Trachea
• Nasal cavity • Bronchus (bronchi)
Lungs
• Pharynx • Bronchioles
• Epiglottis • Alveoli
• Larynx • Pleura
• Trachea • Diaphragm

4. Figure 10.1

5. Components of the Upper
Respiratory Tract
Figure 10.2

6. Upper Respiratory Tract
Functions
 Passageway for respiration
 Receptors for smell
 Filters incoming air to filter larger foreign
material
 Moistens and warms incoming air
 Resonating chambers for voice

7. Components of the Lower
Respiratory Tract
Figure 10.3

8. Lower Respiratory Tract
 Functions:
 Larynx: maintains an open airway, routes food
and air appropriately, assists in sound production
 Trachea: transports air to and from lungs
 Bronchi: branch into lungs
 Lungs: transport air to alveoli for gas exchange

9. Gas Exchange Between the
Blood and Alveoli
Figure 10.8A

10. Respiratory Cycle
Figure 10.9

11. http://mhln.com

12. Measurement of Lung Capacity
Figure 10.10A

13. Disorders of Respiratory System
 Reduced air flow:
asthma, emphysema, bronchitis
 Infections:
pneumonia, tuberculosis, botulism
 Lung cancer
 Congestive heart failure
 Cystic fibrosis

14. Relationship to digestive system
• Cellular respiration requires
glucose and oxygen to release
energy to the body
• C6H12O6 + 6O2  6CO2 + 6 H2O + Energy
• Oxygen is provided by the respiratory
system
• Glucose is provided by the digestive
system
• (glucose is made during photosynthesis)