Digestion and Absorption – Notes
The Human Digestive System
The alimentary canal includes organs such as the mouth, pharynx, oesophagus, stomach, small intestine, large intestine and anus.
The mouth, the anterior opening of the alimentary canal, leads to the buccal cavity or oral cavity, which contains the teeth and the tongue.
The tongue helps push the food from the oral cavity into the phaynx, the passageway for air and food.
The pharynx opens into the windpipe or trachea and the oesophagus.
The stomach, an important organ of the alimentary canal, is located in the upper left part of the abdominal cavity between the oesophagus and the first part of the small intestine called the duodenum.
The duodenum, jejunum and ileum make up the small intestine.
The large intestine is divided into three regions- the caecum, colon and rectum.
The salivary glands, liver and pancreas are collectively known as the digestive glands.
Digestion of Food
The teeth, present in the oral cavity, masticate the food, while the tongue mixes it with saliva, which is rich in enzymes, salivary amylase, lysozyme and electrolytes.