chapter18a Gas Exchange and Transport 1

chapter18a Gas Exchange and Transport 1 - Chapter 18a Gas...

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Chapter 18a Gas Exchange and Transport
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About this Chapter Diffusion and solubility of gases Gas exchange in lungs and tissues Gas transport in the blood Regulation of ventilation
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Figure 18-1 Overview Oxygen and carbon dioxide move into and out of the blood at pulmonary and systemic capillaries Internal respiration 6 5 4 3 CO2 O2 Alveoli of lungs Airways CO2 CO2 O2 O2 Pulmonary circulation CO2 O2 Cellular respiration ATP Nutrients Cells Systemic circulation CO2 O2 Oxygen exchange at cells Oxygen transport CO2 exchange at alveolar-capillary interface Oxygen exchange at alveolar-capillary interface CO2 exchange at cells CO2 transport 2 1
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Diffusion and Solubility Constants influencing diffusion in the lungs Surface area Contact between air and blood Membrane thickness Alveoli and endothelium Diffusion distance Distance between blood and air Concentration gradient Most important factor as others usually are constant
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Movement of Gases Pressure gradient Partial pressure change Solubility Gas into liquid Temperature Higher faster
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Figure 18-2a–c Gases in Solution (a) P O 2 = 100 mm Hg P O 2 = 0 mm Hg (b) (c) P O 2 = 100 mm Hg [O2] = 5.20 mmol/L P O 2 = 100 mm Hg [O2] = 0.15 mmol/L
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Figure 18-2c–d Gases in Solution (c) 100 mm Hg [O2] = 5.20 mmol/L [O2] = 0.15 mmol/L (d) 100 mm Hg [CO2] = 5.20 mmol/L [CO2] = 3.00 mmol/L P O2 = 100 mm Hg P O2 = P CO2 = 100 mm Hg P CO2 = Solubility difference between O2 and CO2
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Figure 18-3 Gas Diffusion PO2 = 100 mm Hg Alveoli Peripheral tissue Alveoli Peripheral tissue (b) CO2 diffusion (a) Oxygen diffusion Circulatory
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This note was uploaded on 01/03/2012 for the course BIO 308 taught by Professor Acbrown during the Spring '10 term at Portland.

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chapter18a Gas Exchange and Transport 1 - Chapter 18a Gas...

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