DR GLADDEN WILLIS, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY DR GLADDEN WILLIS, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
Vein in cross-section. Light micrograph of a cross-section through a small, thin-walled human vein. These blood vessels bring blood back to the heart from the rest of the body. The walls of veins are not as thick as arteries, as the blood is at a lower pressure. This sample was prepared with a trichrome stain.
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