Diffusion and active transport are likely to be important in

A) mastication of food.
B) absorption of food.
C) elimination of undigested food.
D) propulsion of food through the digestive tract.
E) mixing of food.

Diffusion

Tendency for solute molecules to move from an area of high concentration to an area of low concentration in solution; the product of the constant random motion of all atoms, molecules, or ions in a solution.

Active Transport

The process where molecules travel through a cellular membrane from an area of lesser concentration to an area of greater concentration, necessitating the use of energy.

Absorption

The process by which nutrients, drugs, and other substances are taken up from the gastrointestinal tract into the bloodstream.