Intestinal microvilli. Transmission electron micrograph (TEM) of a section through an epithelial cell from the small intestine, showing the densely packed microvilli (purple). Each microvillus is approximately 1 micrometre long by 0.1 micrometer in diameter and contains a core of actin microfilaments. These tiny structures form a dense brush-like covering on the absorptive surfaces of the cells lining the small intestine. The cells absorb nutrients from digested food through the microvilli. Magnification: x6000 when printed 10 centimetres wide.
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