BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrographs of sections of a healthy artery (left), and an artery that is partially blocked by an atheroma (right). Atheroma is the deposition of fatty material on the inner walls of an artery. This can greatly reduce the size of the lumen (inner space, white) which causes a reduction in blood flow (ischaemia) to the tissue supplied by the artery. If the atheroma blocked an artery leading to the heart it would cause a heart attack.
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