The Respiratory System

2. Respiration
• Inhalation
• Exhalation

3. The RS helps us to:
• Transport air into the lungs.
• Facilitate the diffusion of oxygen into the
blood stream.
• Pick up waste carbon dioxide from the blood
and exhale it.

4. Phases of Respiration
• External Respiration
• Internal Respiration

5. Parts and Functions
Mouth, Nose, and
Nasal Cavity
• These three parts
warm and moisten
the incoming air.

6. Pharynx
• Contains the
windpipe/trachea
and the food pipe or
esophagus.
• Epiglottis prevents
the food from
entering the trachea.

7. Larynx
• The voice box.
• Helps protect the
trachea by producing
strong cough reflex if
any solid object
passes the epiglottis.

8. Trachea
• Filter
• Carries air from
throat into the
lungs.
• It is covered with
cilia.

9. Bronchi
• Carry air directly
into the lungs.

10. Bronchioles
• Tertiary bronchi.
• Carry air to the
Alveoli.

11. Alveoli
• Permit the exchange
of gases, oxygen and
carbon dioxide.
• 3 million alveoli

12. Diaphragm
• It is the main muscle.