BIO 101 Chapter 10 Respiratory Notes.docx

BIO 101 Chapter 10 Respiratory Notes.docx - BIO 101 Chapter...

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BIO 101 Chapter 10 “Respiratory System” Notes Principles of Gas Exchange: Partial Pressure of Gases 1. Atmospheric pressure = 769 mm Hg which is the sum pressure of the component gases. 2. Earth’s atmosphere is 21% O2 and .04% CO2 3. Partial pressures: 160 mm O2, 0.3 mm CO2 4. In the body: 40 mm O2; 45 mm CO2. 5. Differences drive O2 into blood and CO2 out. Principles of Gas Exchange: Surface-to-volume Ratio 1. Small organisms can do gas exchange through the skin by having a high surface-to-volume ratio—thin & flat. 2. Within gills or lungs – use large surface area in gill filaments or alveoli. 3. The larger the surface area, the faster the rate of gas exchange. Principles of Gas Exchange: Ventilation 1. Movement of fluid or air around gas exchanging tissues. 2. Removes low O2/high CO2 fluid or air.
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  • Summer '11
  • Pulmonary alveolus, 0.3 mm, 04%

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