13. Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine,however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poorcytoplasm. Using this information, which transport mechanism is most probably functioning in theintestinal cells?
(A) simple diffusion
(B) phagocytosis
(C) active transport pumps
(D) facilitated diffusion