Substance X is a mostly polar molecule and Substance Y is a mostly non-polar molecule of a similar size. Which will diffuse from the extracellular fluid to the intracellular fluid faster if they are in equal concentrations outside and inside the cell?
A. Substance X will diffuse faster.
B. Substance X and Substance Y will diffuse at the same rate, as they are of equal size and concentration.
C. Substance Y will diffuse faster.
Answer: C
Anatomy & Physiology
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