So starting with the digestive system, digestion begins in the mouth where food is acted upon by saliva and enzymes like amylase. The flow of saliva is set in motion by a brain reflex that sets in when we see of smell food. Amylase breaks down some of the carbohydrates (starches and sugars) in the food in the mouth itself and by the act of chewing food is broken down into small bolus. From the mouth, the food moves into moves the food into the throat or pharynx which is a common pipe for air and food. It divides into two: the food pipe and trachea and the epiglottis separates the two so that food mistakenly does not enter the windpipe or trachea. From the pharynx, food travels down a muscular tube in the chest called the oesophagus which is also called the food pipe. There are a number of muscular contractions called peristalsis which propels the bolus of food forward. At the lower end of esophagus, there is an esophageal spincter which acts as a gateway which allows food to enter the stomach and then squeezes shut to keep food or fluid from flowing back up into the esophagus. The stomach acts like a mixer grinder where the food churns and mixes with acids and enzymes like pepsin converting it into small digestible pieces. It leaves the stomach in the form of chime (a thick gravy like liquid) and enters the duodenum. At the lower end of stomach also there is another spincter which does not allow food to turn back once it enters duodenum. Duodenum is the first part of small intestine and the other parts are jejunum and ileum (the terminal part). Here the lining of the small intestine has many finger like projections called villi through which nutrients can be absorbed into the body. The small intestine is also in close proximity to the liver, gall bladder and pancreas which although are not directly related to the digestion but are important in secreting enzymes for