Digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube called gastrointestinal tract (GI tract). The GI tract is made up of the oral cavity, pharynx, oesophagus, stomach, small intestines, and large intestines. In addition to the GI tract, there are several important accessory organs that help human body to digest food but do not have food pass through them. Accessory organs of the digestive system include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.  The six major functions of digestive system are: Ingestion, Secretion, Mixing and movement, Digestion, Absorption, and Excretion.  Regular intake of dietary fibres, and regular exercises help in maintaining healthy digestive system.