The small intestine or small bowel is an organ in the gastrointestinal tract where most of the end The surface area of the human small intestinal mucosa, due to enlargement caused by folds, villi and microvilli, averages 30 square meters. . Lactase is absent in some adult humans and, for them, lactose (a disaccharide).
Human Anatomy. By Matthew Illustration of Human Intestines © 2014 The intestines include the small intestine, large intestine, and rectum.
The gastrointestinal tracts of the Chimpanzee, Orangutan, and adult human and a human fetus were studied and compared by Stevens and Hume in 1995.
"The small intestine in adults is a long and narrow tube about 7 meters (23 feet) long. The large intestine is so called because it is wide in diameter. However.
The average length of the adult human small intestine is approximately 600 cm, as calculated from studies performed on cadavers. According.