1. The Respiratory System
Chapter 4

2. Function: The system of the body that deals with breathing
The body takes in the oxygen that it needs and removes the carbon dioxide that it doesn’t

3. Parts of the System Nasal Passage way Trachea Lungs Diaphragm
Nose, Pharynx, and larynx
Trachea
splits into bronchi
bronchioles
Lungs
Bronchioles
Alveoli
Diaphragm

4. Air Pathway Nose Main passageway Protects and Heats the air Pharynx
Throat
Food and Air pass through this
Larynx
Voice box

5. Air Pathway Trachea (windpipe): Rings of cartilage
Mucus: traps foreign particles
Cilia: hair-like structures that move the particles out

6. Air Pathway Bronchi Two branches Carry oxygen to each lung Bronchioles
Many smaller tubes (<1mm diameter)

7. Air Pathway Alveoli surrounded by capillaries Grapelike structures
Blood travels single file
Grapelike structures
Where gas exchange occurs
Average adult's lungs contain about 600 million

8. The Diaphragm
The muscle that controls the breathing process.

9. Breathing Inhale Exhale Diaphragm muscle contracts
Moves down
Rib muscles contract to pull ribs up and out
Forces air (02) in
Once in the lungs cellular respiration occurs
Diaphragm muscle relaxes
Rib muscles relax
Air (CO2) forced out

10. Respiratory Disorders
Asthma
Bronchioles narrow
Severe Acute Respiratory Syndrome (SARS)
Serious form of pneumonia
Emphysema
Alveoli have been damages
Lack of oxygen
Lung Cancer

11. Smokers lungs
Stuff in cigarettes

13. Average Lung Capacity Compare your results from the bubble lab
8th Grade Female Liters
8th Grade Male Liters