Pregnancy permanently lengthens the small intestine in mice, enhancing nutrient absorption for mother and offspring. Genetic ...

The cells within the villi are represented by multicolored imperfect circles (2). Click on the right arrow to see a cross section through a single villus. Biology in the background The small intestine ...

Alveoli in the lungs, fish gills and the villi in the small intestine are adapted so that they have short diffusion distance, big concentration difference and large surface area. This means that ...