1. The oxygen diffusion coefficient in tissue is about 1.1x 10 cm² s'. The fluid filtration velocity is typically 1 μm s. (a) How large a distance between capillaries would be needed for convection to influence oxygen transport to tissues? (b) Based upon reported values for the distance between capillaries, do you think that convection is an important mechanism for oxygen transport in tissues? 2. The solubility of oxygen in plasma at 37°C is 1.4 x 106 mol L mmHg. The heme concentration in red blood cells is 0.0203 mol L-4CH- The blood volume fraction (hematocrit) is typically 0.45 for men and 0.40 for women. Determine the fraction of oxygen in solution and that bound to hemoglobin in arterial and venous blood. For simplicity, assume that the solubility in red blood cells equals the solubility in plasma. 3. Compare the amount of oxygen taken up by blood and the amount of carbon dioxide released by the blood as blood passes through the lung capillaries. The difference in carbon dioxide (at standard temperature and pressure) between arteries and veins in the lung is 2.27 cm³ per 100 cm' for plasma carbon dioxide and 1.98 cm' per 100 cm' for red-blood-cell carbon dioxide (Share data for Problem 2 and 3).