English: Figure A shows the normal digital arteries with normal blood flow to the fingers. The inset images show cross-sections of a normal artery. Figure B shows white discoloration of the fingertips caused by blocked blood flow. Figure C shows narrowed digital arteries, causing blocked blood flow and purple discoloration of the fingertips. The inset images show cross-sections of a narrowed artery blocking the flow of blood. (Photo credit: Wikipedia)
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