How many square meters is the intestine area of an adult?

The intestine of an adult is about 400 square meters in size.

The intestine is a three-dimensional organ, not a flat surface. It is mainly composed of two parts, the small intestine, which is about 6-7 meters long and 2.5-3 centimeters in diameter, and the large intestine, which is about 1.5 meters long and 4 - 6 centimeters in diameter. These structures greatly increase the surface area of the intestine due to the large number of villi and microvilli covering the inner surface of the intestine. So, if the intestine is laid out flat, and the length, diameter and folds of the intestine are taken into account, the total area can usually reach 400 square meters.