What is the small intestine?
The small intestine is a long twisted tube that extends from the human stomach to the place where it connects to a thick missile. It is divided into three different parts: duodenum, jejunum and ileum. The duodenum is the first section and is a place where most of the digestion occurs. It is also a place where bile and pancreatic juices are excreted into the intestine to help in digestion. Junum and Ileum are the second and third sections. When food is used, it moves down the esophagus and enters the stomach where they spew them and mix with stomach juices. The food is partially broken here and the resulting can be moved to the intestine. Many nutrients are extracted in the small intestine and are sent to the liver through blood for processing. The body of the lymphatic fluid circulates fat -soluble substances, such as the rest of the pesticides and fertilizer before you go to the liver for processing.
The surface of the small intestine is also covered with circular folds, villas and microvilli. Those withTrucctures work to enlarge the surface area of the small intestine for nutrient absorption. Villi is a finger -like projection that works on the absorption of nutrients in food, and microvilli are hair projections on villas that work to complete the disintegration of carbohydrates and proteins. Killi and microvilli are more numerous closer to the stomach than they are closer to the large intestine. Circular folds are folds in the wall of the small intestine, which cause to catch the spiral and slow down to be more efficiently absorbing nutrients.
According to many calculations, the small intestine is one of the longest organs in the human body. This part of the intestine is 1-1.6 inches wide (2.5-4 cm) and about 20 ft (6-7 m). Lengtato part of the intestine allows a large surface area to absorb nutrients. The surface area is also increased by using circular folds, villi and microvilli - up to 600 times, that it would be without them. Some measurements compare the surface area of this part of the intestine with the floor space of the average two story dOm, about 2,152 square feet (200 square meters).