The organs, which take part in the process of digestion, make the digestive system. The human digestive system consists of two sets of organs.
1. The alimentary canal is concerned with ingestion, digestion, absorption and egestion of undigested food. The parts of the alimentary canal are mouth, oral cavity, pharynx, oesophagus (esophagus), stomach, small intestine and large intestine.
2. The digestive glands are associated with the alimentary canal and help in digestion.
The digestive glands are, salivary glands, gastric glands, intestinal glands, liver and pancreas.
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Alimentary canal is also known as gut or digestive tract or gastrointestinal tract. It is a continuous tube. The tube is about 9 meters long in adult. It is specialized at various points along its length. It's each region is designed to carry out a different function in the overall process of digestion, absorption and egestion. Alimentary canal begins from the mouth and ends at the anus. It is lined internally by mucous membrane.
1.2.2 Associated Organs
It includes teeth, tongue, salivary glands, liver, gallbladder and pancreas.
1. Teeth
The four types of teeth are incisors, canines, premolars, and molars. Incisors bite into food and cut it into smaller pieces. Canines are used to tear food. Premolars help to chew and grind up food. Molars chew food and grind it up.