STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Intestinal microvilli. Transmission electron micrograph (TEM) of a section through an epithelial cell from a human small intestine, showing the densely packed microvilli. Each microvillus is approximately 1um long by 0.1um 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 at 10 centimetres wide.
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