6.8 Exchange of Gases in the lungs

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  • 6.8 Exchange of Gases in the lungs
    • Role of alveoli in GE
      • 300 mil alv each human lung. Total SA = 70m(/\2) - half tennis court
        • Lined w/ epithelial cells - thin.
        • Around each alv = pulmonary capillaries - narrow - RBC flattened against cm - Capillaries - 1 cell thick -
      • Diff gases BTWN alveoli & blood rapid
        • RBC slowed as pass = more diff time
          • Dist btwn alv air & capillaries v thi = short diff path
        • Alveoli & pulmonary capillaries = v large total SA
        • Steep conc grd maint. by brathing movements + action of heart const circulates blood
        • Blood flow through pulmonary capillaries maint conc gradient

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