Because the concentration of digested food is much higher in the small intestine than it is in the blood, absorption occurs by diffusion.

Question

Quizplus · Accepted Answer

Absorption in the small intestine primarily occurs through active transport and facilitated diffusion, not just simple diffusion, because nutrients often need to be moved against their concentration gradient from the intestine into the blood.

Because the Concentration of Digested Food Is Much Higher in the Small