The stomach is a muscular sac that is important for absorbing food and preparing food for further digestion.
The small intestine, also referred to as small bowel, is a tubular structure that is a part of the digestive tract. It carries the food from the stomach to the large intestine or colon. Small intestine is that part of the digestive tract, where most of the digestion and absorption of food particles happens. The small intestine is divided into three parts: duodenum (which receives partly digested food and chemicals from the stomach), jejunum (that part of the small intestine, where most of the absorption of nutrients happens) and ileum (that part of the small intestine, where the nutrients that are not absorbed by the ileum are absorbed). The first part of the small intestine (duodenum) is connected to the stomach and the last part of the small intestine (ileum) is connected to the first portion of the large intestine. The length of the small intestine is estimated to be around 3 times the height of an adult.