The small intestine uses active transport to take up nutrients after concentration has reached equilibrium. The correct option is C.
Active transport refers to the movement of disbanded molecules either into or out of a cell via the cell membrane, from a low concentration region to a high concentration region.
The molecules use the energy released during respiration to move against the gradient of concentration.
Particles in active transport relocate against the gradient of concentration and thus require energy input from the cell.
The villi in the small intestine absorb the soluble nutrients during digestion. The concentration of nutrients in the villi eventually reaches an equilibrium with the concentration in the gut.
Most proteins are absorbed as their degradation products, amino acids, by active transport mechanisms, which are found primarily in the duodenum and jejunum.
Thus, the correct option is C.
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