BASIC PHYSIOLOGY

Digestion is the physiological process by which large molecules of food are broken down into smaller molecules to be absorbed and utilized by the body.Digestive system is formed of: Alimentary tract (GUT) or gastrointestinal tract (GIT), digestive glands. GIT MOTILITY includes: Peristaltic movement (peristalsis), Mixing (segmenting) movements andIndividual movements of GIT like Mastication (chewing),Swallowing (Deglutition). Secretory and digestive functions of GIT: Presence of food in GIT segments → secretion of moderate to large quantities of digestive juices via: 1-Tactile or chemical stimulation of the mucosa 2-Mechanical distension