How is most oxygen transported in the blood?
a. On red blood cell membranes
b. Bonded to hemoglobin in blood plasma
c. Bonded to hemoglobin in red blood cells
d. In blood plasma as free oxygen
ANS: C
Hemoglobin carries oxygen in the blood. Hemoglobin is in red blood cells, not on cell membranes or in plasma. Oxygen is not transported free in plasma.
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