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
Trachea
Bronchus (bronchi)
Bronchioles
Alveoli
Pleura
Diaphragm
Nose / mouth
Nasal cavity
Pharynx
Epiglottis
Larynx
Trachea
Lungs

5. Mouth & Nose Brings air into the body
Nasal hairs in nostrils trap dust

6. Nasal cavity Warms & moistens air
Glands that produce sticky mucus line the nasal cavity
traps dust, pollen, and other materials that were not trapped by nasal hairs
cilia sweep mucus and trapped material to the back of the throat where it can be swallowed

7. Pharynx Tube-like passageway used by food, liquid, and air
At the lower end of the pharynx is a flap of tissue called the epiglottis
covers the trachea during swallowing so that food does not enter the lungs

8. Larynx
“Voice box”
The airway to which two pairs of horizontal folds of tissue, called vocal cords, are attached

9. Trachea Air-conducting tube Connects the larynx with the bronchi
Lined with mucous membranes and cilia
Contains strong cartilage rings

10. Bronchi Two short tubes that branch off the lower end of the trachea
Carry air into the lungs.
Singular - bronchus

11. Bronchioles Tiny branches of air tubes in the lungs
Connect bronchi to alveoli

12. Alveoli
Tiny, thin-walled, grapelike clusters at the end of each bronchiole
Surrounded by capillaries
Where carbon dioxide and oxygen exchange take place
Singular - alveolus

14. Diffusion

15. Pleura
Membrane lining the lungs and chest cavity

16. Diaphragm
Muscle wall between the chest and the abdomen that the body uses for breathing

18. 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)