What is the main fiction of digestive system?

The main fiction of the digestive system is the conversion of food into energy and nutrients that the body can use. This process begins in the mouth, where food is chewed and mixed with saliva to form a soft mass called a bolus. The bolus then travels down the esophagus to the stomach, where it is further broken down by stomach acids and enzymes. The stomach also churns the food, which helps to break it down even further.

From the stomach, the food moves into the small intestine. Here, it is mixed with bile from the liver and enzymes from the pancreas. These substances help to break down the food even further, and the nutrients in the food are absorbed into the bloodstream.

The large intestine is the final part of the digestive system. Here, water is absorbed from the food, and the remaining waste products are formed into stool. The stool is then expelled from the body through the rectum.