1. Respiratory System

2. Respiration
The energy
releasing process
that is fueled by
oxygen.

3. Function of the Respiratory System
To get oxygen into the body & remove carbon dioxide and water from the body.

4. Diagram of Upper & Lower Respiratory Systems

5. UPPER RESPIRATORY SYSTEM
nose
nasal cavity
pharynx

6. The Nose Air enters through 2 openings called nostrils
Wall of cartilage separates the 2 nostrils
Air is heated by warm blood flowing through blood vessels in the lining of the nasal cavities
Mucus keeps air moist & keeps tissues from drying out

7. The Nose Continued
Mucus along with little hairs called cilia trap tiny particles entering the nose
These cilia also sweep old mucus towards the esophagus & down to the stomach where it is destroyed by hydrochloric acid

8. CILIA

9. Lower
Respiratory
System
Larynx
Trachea
Bronchi
Bronchioles
Alveoli

10. The Anatomy of the Larynx
(voicebox)

11. Trachea (windpipe) Bronchus Bronchus bronchioles bronchioles alveoli
diaphragm

12. Diaphragm
Main muscle used in breathing

13. Diaphragm Dome-shaped muscle at the bottom of the lungs.
When you breathe in, the diaphragm contracts and flattens out while pulling downward. This movement enlarges the space that the lungs are in. This larger space pulls air into the lungs.
When you breathe out, the diaphragm relaxes reducing the amount of space for the lungs and forcing air out.
The diaphragm is the main muscle used in breathing.