THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Digestion is the process of mechanically and enzymatically breaking down food into substances for absorption into the bloodstream. The food contains three macronutrients that require digestion before they can be absorbed: fats, carbohydrates, and proteins.

Detailed explanation-2: -Digestion works by moving food through the GI tract. Digestion begins in the mouth with chewing and ends in the small intestine. As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules.

Detailed explanation-3: -Hydro-stands for water while-lysis stands for the breaking down of molecules. Hence, hydrolysis is the chemical breakdown of a substance using water. During hydrolysis, a macromolecule is broken down into simpler units. It helps the small intestine to absorb nutrients more effectively.

Detailed explanation-4: -In either case, the large polymeric molecules in food are broken down during digestion into their monomer subunits-proteins into amino acids, polysaccharides into sugars, and fats into fatty acids and glycerol-through the action of enzymes.