Intestinal villi. Coloured scanning electron micrograph (SEM) of villi on the lining of the small intestine. Villi are finger-like projections that line the surface of the small intestine and increase the surface area available for the absorption of nutrients from digested food. Magnification: x135 when printed 10 centimetres wide.
Close-up of the tongue-shaped villi of the jejunum region of the small intestine as viewed from the lumen. **On Page Credit Required**
This representation shows the connectivity of the 10,000 neurons and 30 million connections that make up a single neocortical column. (The different colors correspond to different levels of electrical activity.) Wow!
An electron microscope catches the immune system blooming into action. A white blood cell (red) wraps itself around a mycobacterium tuberculosis, the causative agent of most cases of tuberculosis.