AP BIOLOGY

Detailed explanation-1: -As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the rest of the body.

Detailed explanation-2: -There are 4 steps to digestion: Eat food. Break down the food into tiny pieces. Absorb nutrition into the body: move the small particles out of the digestive system and the rest of the body.

Detailed explanation-3: -Absorption is the process by which the products of digestion are absorbed by the blood to be supplied to the rest of the body. During absorption, the digested products are transported into the blood or lymph through the mucous membrane.

Detailed explanation-4: -Assimilation is the process of conversion of absorbed food complex substances such as proteins and vitamins required by the body. It is the absorption of nutrients into the living tissue.