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5 to 1 micrometers thick

5 to 1 micrometers thick - .5 to 1 micrometers thick Gas...

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.5 to 1 micrometers thick. Gas exchange is very efficient through this thin surface. . INTERNAL RESPIRATION (CAPILLARY GAS EXCHANGE )-movement of oxygen from blood to the tissue cells and of carbon dioxide from tissue cells to blood. A. In this case the partial pressures and diffusion gradients are reversed from the above situation. B. P O2 is always lower in tissues than in the surrounding systemic arterial blood; thus, oxygen moves from the _______________ to the ______________. The case is reversed for carbon dioxide. Its partial pressure is greater in tissues compared to the surrounding blood supply, therefore, carbon dioxide moves from ____________ to ______________. C. In summary, gas exchanges occur between the blood and alveoli and the blood and tissues based on partial pressure gradients. These exchanges are the result of simple diffusion across respiratory membranes. . TRANSPORT OF OXYGEN AND CARBON DIOXIDE BY THE BLOOD A. Oxygen Transport 1. Oxygen is carried in the blood in 2 ways : a. Attached to the red pigment hemoglobin within erythrocytes. b. Dissolved in plasma. Only a small fraction of oxygen is carried in this manner since oxygen is poorly soluble in water. 2. Hemoglobin (Hb)- review the structure of hemoglobin from chapter 17.
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