Most of the oxygen transported by the blood is___________.
a. bound to a plasma protein.
b. carried by white blood cells.
c. bound to hemoglobin.
d. dissolved in plasma.
e. in ionic form as solute in the plasma.

The oxygen is relatively insoluble in plasma. At normal atmospheric pressure, only 0,3% of oxygen dissolves. That why there are respiratory pigments that elevate almost 70 times the capacity to transport O₂ of blood. The most common respiratory pigments are hemoglobin (in all vertebrates and some invertebrates) and hemocyanin (in mollusks and arthropods).

Most of the oxygen transported by the blood is___________. a. bound to a plasma protein. b. carried by white blood cells. c. bound to hemoglobin. d. dissolved in plasma. e. in ionic form as solute in the plasma.

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Most of the oxygen transported by the blood is___________.
a. bound to a plasma protein.
b. carried by white blood cells.
c. bound to hemoglobin.
d. dissolved in plasma.
e. in ionic form as solute in the plasma.