RESPIRATORY SYSTEM External respiration Internal respiration
RESPIRATION External Internal Between blood and cell Between environment and lungs http://activity.ntsec.gov.tw/lifeworld/english/content/body_cc4.html
RESPIRATORY TRACT Epiglottis Bronchi
TUBULAR PASSAGEWAY FOR AIR TRACHEA Bronchioles
http://www.youtube.com/watch?v=HiT621PrrO0 Respiration Video
The Mechanics of Breathing
DIAPHRAGM Dome-shaped muscle attached to rib cage that contracts& flattens out during breathing
Observe what happens to the diaphragm.
PRESSURE force of air pressing down Less air particles- Low air pressure More air particles- High air pressure
How do you change the pressure? High to Low Pressure (Many to Less) How do you change the pressure?
Air pressure (inside balloon Air pressure (empty space) Air pressure (outside air)
Breathing – The Lungs "nature hates a vacuum" Breathing animation 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 "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" http://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html
Gas Exchange
Air Composition Inhaled air Exhaled 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://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html http://patrickpoon.com/etp/Diffusion.html
http://patrickpoon.com/etp/Diffusion.html DIFFUSION
Alveoli venule (deoxygenated blood) arteriole (oxygenated blood) CO2 and O2 exchanged at the same time venule (deoxygenated blood) arteriole (oxygenated blood)
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
Respiration Food + 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