1. RESPIRATORY SYSTEM
External respiration
Internal respiration

2. RESPIRATION External Internal Between blood and cell
Between environment and lungs

3. RESPIRATORY
TRACT
Epiglottis
Bronchi

4. TUBULAR PASSAGEWAY FOR AIR
TRACHEA
Bronchioles

5.
Respiration Video

6. The Mechanics of Breathing

7. DIAPHRAGM
Dome-shaped muscle attached to rib cage that contracts& flattens out during breathing

8. Observe what happens to the diaphragm.

9. PRESSURE force of air pressing down
Less air particles- Low air pressure
More air particles- High air pressure

10. How do you change the pressure?
High to Low Pressure
(Many to Less)
How do you change the pressure?

11. Air pressure (inside balloon
Air pressure (empty space)
Air pressure (outside air)

13. Breathing – The Lungs "nature hates a vacuum" Breathing animation

14. Breathing in - inhaling
Rib cage
expands
Diaphragm
moves downward
Pressure
reduces inside lung
Result – air is drawn into the lungs

15. Breathing out - exhaling
Rib cage
contracts
Diaphragm
moves upward / inward
Pressure
increases inside lung
Result – air is pushed out of the lung

16. BREATHING

17. Breathing – The Lungs "nature hates a vacuum"
Breathing animation
Write a paragraph explanation/ summary on how breathing works. Discuss the role of the ribcage and the diaphragm and how these creates a pressure difference so breathing can take place.
"nature hates a vacuum"

18. Gas Exchange

20. Air Composition Inhaled air Exhaled air Nitrogen N2 – 79%
Oxygen O2 – 20%
CO2 – 0.04%
Others %
Exhaled air
Nitrogen N2 – 79%
Oxygen O2 – 16%
CO2 – 4%
Others - 1%

21. Breathing – The Alveoli
Diffusion
The movement of gas from an area of high concentration to an area of low concentration.

22.
DIFFUSION

24. Alveoli venule (deoxygenated blood) arteriole (oxygenated blood)
CO2 and O2 exchanged at the same time
venule (deoxygenated blood)
arteriole (oxygenated blood)

26. Breathing – The Alveoli
Breathing in
Breathing out
high concentration
of oxygen
low concentration
of carbon dioxide
To the heart
From the heart O2 O2 O2
CO2 O2 O2
CO2
CO2
CO2
CO2
low concentration
of oxygen
high concentration
of carbon dioxide
Diffusion

28. Respiration Food + Oxygen  CO2 + water + ENERGY
Glucose + O2  CO2 + water + ENERGY
C6H12O6 + O2  CO2 + H2O + ENERGY
C6H12O6 + 6O2  6CO2 + 6H2O + ENERGY

29. Cell Respiration
C6H12O O2  6CO2 + 6H2O + Energy