HUMAN NUTRITION

Detailed explanation-1: -Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.

Detailed explanation-2: -The digestive system converts the foods we eat into their simplest forms, like glucose (sugars), amino acids (that make up protein) or fatty acids (that make up fats). The broken-down food is then absorbed into the bloodstream from the small intestine and the nutrients are carried to each cell in the body.

Detailed explanation-3: -Mechanical digestion is the physical process of structures like teeth in the mouth and muscles in the stomach churning food into smaller pieces. This makes it easier for enzymes to digest food as it increases the surface area that enzymes can act on.