Why is the small intestine called intestine?

The small intestine is called the intestine because it was once thought to be the only part of the digestive system responsible for the absorption of nutrients. The word "intestine" comes from the Latin word "intestinum", which means "inner tube". The small intestine is a long, thin tube that connects the stomach to the large intestine. It is responsible for the absorption of nutrients from food, and it is also the site where some vitamins and minerals are produced.