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Gas Exchange: Location and the Alveoli

Gas Exchange: Location and the Alveoli. Nate Wardwell, Jessica DeFinis, and Thanh Pham. What are Alveoli?. Little Sacs in Lungs Function: Location of Gas Exchange Lined with Pulmonary Capillaries MASSIVE surface area (75 m 2 ). http://www.clevelandareaph.com/Lungs_and_alveoli.gif.

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Gas Exchange: Location and the Alveoli

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  1. Gas Exchange: Location and the Alveoli Nate Wardwell, Jessica DeFinis, and Thanh Pham

  2. What are Alveoli? Little Sacs in Lungs • Function: Location of Gas Exchange • Lined with Pulmonary Capillaries • MASSIVE surface area (75 m2) http://www.clevelandareaph.com/Lungs_and_alveoli.gif

  3. How do Alveoli Work? (Basics) • Inhale => O2 into alveoli • => into blood stream • Exhale => CO2 diffuses from capillaries into alveoli • => out of body http://www.le.ac.uk/pathology/teach/va/anatomy/case2/frmst2.html

  4. Inhalation • Pressure Gradient: • High O2 in Alveoli • Low O2 in Capillaries • O2 can’t dissolve well in blood plasma • Hemoglobin= easy for O2 to attach to • Becomes oxyhemoglobin (HbO2) http://z.about.com/f/p/440/graphics/images/en/19443.jpg

  5. Exhalation • CO2 is largely carried in blood as HCO3- (60%) • 30% on Hemoglobin (Carbamino hemoglobin) • 10% Dissolved • Is converted back to CO2 in alveoli by red blood cells • Pressure Gradient! • High CO2 in Blood • Low CO2 in Alveoli http://www.emptynosesyndrome.org/pics/image007.gif

  6. Summary Video http://www.youtube.com/watch?v=bwXvqSqAgKc

  7. Bibliography • Starr, Cecie, and Ralph Taggart. Biology: The Unity and Diversity of Life. 9th. United States of America: Brooks/Cole, 2001. • "Bio 301: Human Psychology ." Human Pyysiology-Respiration. 28 Oct 2008 <http://people.eku.edu/ritchisong/RITCHISO//301notes6.htm>.

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