Respiratory System Gas exchange Taken from: .
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Transcript of Respiratory System Gas exchange Taken from: .
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Respiratory SystemGas exchange
Taken from:www.wou.edu
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• Why do we breathe?
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Terminology!
• Cellular respiration is the aerobic breakdown of glucose in the mitochondria to make ATP.
• Respiratory systems are the organs in animals that exchange gases with the environment.
• “Respiration” is an everyday term that is often used to mean “breathing.”
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Respiratory system function
Respiratory systems allow animals to move oxygen (needed for cellular respiration) into body tissues and remove carbon dioxide (waste product of cellular respiration) from cells.
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Respiration by Diffusion
• In some animals gases diffuse through their skins.
• These animals have a low metabolic rate.
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Specialized structures• gills (aquatic
animals)
• spiracles (terrestrial insects)
• lungs (most terrestrial vertebrates)
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Parts of the respiratory system include:
• Nasal cavity• Pharynx• Larynx• Trachea• Bronchi• Bronchioles• Alveoli
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Alveoli
The alveoli are moist, thin-walled pockets which are the site of gas exchange.
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Gas exchange
Takes place due to concentration gradients: differences of concentration of O2 and CO2 between the alveoli and the capillary.
http://bodysystems-rlj00.blogspot.com/
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How do O2 and CO2 move?
http://www.toltec.biz/how_hemodialysis_work
s.htm
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Oxygen transport
• Hemoglobin binds to oxygen that diffuses into the blood stream.
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Carbon dioxide transport
• Carbon dioxide can dissolve in plasma, and about 70% forms bicarbonate ions.
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