APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The principal functions of the gastrointestinal tract are to digest and absorb ingested nutrients, and to excrete waste products of digestion. Most nutrients are ingested in a form that is either too complex for absorption or insoluble, and therefore, indigestible or incapable of being digested.

Detailed explanation-2: -Ingestion. The first activity of the digestive system is to take in food through the mouth. This process, called ingestion, has to take place before anything else can happen.

Detailed explanation-3: -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.