Capillaries. Light micrograph of capillaries and a blood vessel in a longitudinal section through the human mesentery. Here, a rich network of fine capillaries are seen branching off a blood vessel, with blood cells appearing rounded. The mesentery is the membranous fold of the small intestine, attaching it to the back of the abdominal wall. Magnification: x200 at 5x7cm size.
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