RESPIRATORY SYSTEM
1.External respiration
2.Internal respiration
RESPIRATIONExternal Internal
Between environment and lungs
Between blood and cell
http://activity.ntsec.gov.tw/lifeworld/english/content/body_cc4.html
RESPIRATORY
TRACT
Bronchi
Epiglottis
TRACHEA
TUBULAR PASSAGEWAY FOR AIR
Bronchioles
http://www.youtube.com/watch?v=HiT621PrrO0Respiration Video
The Mechanics of Breathing
DIAPHRAGMDome-shaped muscle attached to rib cage that contracts& flattens out during breathing
Observe what happens to the diaphragm.
PRESSUREforce of air pressing down
Less air particles- Low air pressure
More air particles- High air pressure
High to Low Pressure
(Many to Less)
How do you change the pressure?
Air pressure (outside air)
Air pressure (empty space)
Air pressure (inside balloon
Breathing – The Lungs
• Breathing animation
"nature hates a vacuum"
http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html
Breathing in - inhaling
• Rib cage– expands
• Diaphragm– moves downward
• Pressure– reduces inside lung
• Result – air is drawn into the lungs
Breathing out - exhaling• Rib cage– contracts
• Diaphragm– moves upward / inward
• Pressure– increases inside lung
• Result – air is pushed out of the lung
BREATHING
Breathing – The Lungs• 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" http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html
Gas Exchange
Air Composition
Inhaled air
Nitrogen N2 – 79% Oxygen O2 – 20% CO2 – 0.04% Others - 0.96%
Exhaled air
Nitrogen N2 – 79% Oxygen O2 – 16% CO2 – 4% Others - 1%
Breathing – The Alveoli
• Diffusion– The movement of gas from an area of high
concentration to an area of low concentration.
http://patrickpoon.com/etp/Diffusion.html
http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html
Alveoli
CO2 and O2 exchanged at the same time
venule (deoxygenated blood)
arteriole (oxygenated blood)
Breathing – The Alveoli
O2
O2 O2
O2
O2 CO
2
CO2
CO2CO2
CO2
Breathing in Breathing outhigh concentrationof oxygen
high concentrationof carbon dioxide
low concentrationof oxygen
low concentrationof carbon dioxide
Diffusion
To the heart
From the heart
RespirationFood + Oxygen CO2 + water + ENERGY
Glucose + O2 CO2 + water + ENERGY
C6H12O6 + O2 CO2 + H2O + ENERGY
C6H12O6 + 6O2 6CO2 + 6H2O + ENERGY
Cell Respiration
C6H12O6 + 6O2 6CO2 + 6H2O + Energy
