Describe the structure and functioning of …

 
The digestive system of man includes mouth, oesophagus, stomach, small intestine, large intestine, ****, liver, pancreas and gall bladder. Digestion starts in mouth. Intake of food is called ingestion. Teeth chew the food. Saliva secreted by salivary glands make it easy to swallow in. Saliva converts starch into sugar. Food then goes to oesophagus, which is simply a tube leading to stomach. No digestion occurs in oesophagus.
Stomach: From the oesophagus, the food goes to the stomach, which is a bag like structure. Stomach secrets various digestive juices, which help in digesting the food.
Intestine: Next organ of digestion is small intestine. It is a seven metres long tube. Pancreatic juice and intestinal juice help in digestion of food. Digestion gets completed here. The digested food is absorbed here in small intestine. Absorption of food is utilised for various body functions. This is called assimilation of food. The food is then passed to large intestine where water is absorbed from food. The undigested food is passed out through ****. This is called egestion.