Although Glucose Molecules Constantly Diffuse into a Red Blood Cell

Although glucose molecules constantly diffuse into a red blood cell along their concentration gradient, equilibrium is never reached and a steep concentration gradient is continually maintained. What causes this?

A) The active transport of glucose
B) The very fast turnover rate of glucose metabolism
C) The ability of the cell to engulf glucose by pinocytosis
D) The continuous excretion of glucose from other parts of the cell
E) The rapid and continuous addition of phosphates onto the glucose molecules

Correct Answer:

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