Different parts of human digestive system performs different functions as mentioned below.

1. Mouth Food is taken into the body through it. It leads into Buccal Cavity. 

2. Buccal cavity contains tongue, teeth and secretions of Salivary glands. Carbohydrate digestion starts here. 

3. Pharynx is the common chamber for both digestive track and respiratory track. It leads into Oesophagus. 

4. Oesophagus is a muscular tubular structure that connects pharynx with Stomach. 

5. Stomach is a muscular sac like structure. Food is grinded well and mix with its juices. Proteins digestions tarts in the stomach. Hydrochloric acid in the stomach kills Bacteria in the food. 

6. Duodenum is the first part of the small intestine. Bile juice from liver, Pancreatic juice from pancreas enters into it and helps in digestion. 

7. Small intestine is about six metre long. Digestion of food is completed here with the help of its juices. Its inner wall have thousands of finger-like outgrowths called villi. They absorb the digested food. Blood transport it to all body parts for assimilation. 

8. Large Intestine absorbs water and minerals from the undigested food. 

9. Rectum storage point for undigested food. 

10. Anus – Fecal matter removed through it.