Transcript Breathing
RESPIRATORY SYSTEM 1.External respiration 2.Internal respiration RESPIRATION External Between environment and lungs Internal Between blood and cell http://activity.ntsec.gov.tw/lifeworld/english/content/body_cc4.html RESPIRATORY TRACT Epiglottis Bronchi TUBULAR PASSAGEWAY FOR AIR Bronchioles TRACHEA 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 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 • 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://www.biosci.ohiou.edu/introbioslab/Bios170/diffusion/Diffusion.html http://patrickpoon.com/etp/Diffusion.html http://patrickpoon.com/etp/Diffusion.html DIFFUSION Alveoli CO2 and O2 exchanged at the same time venule (deoxygenated blood) arteriole (oxygenated blood) Breathing – The Alveoli Breathing in To the heart Breathing out high concentration of oxygen O2 O2 O2 O O2 2 low concentration of carbon dioxide From the heart CO2 CO2 low concentration of oxygen CO2 CO2 CO2 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