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ICSE Class 10 Answered

When we look at the veinson the arms of old people,they appear bluish.Although the blood flowing in the veins is dark red and not blue,then why does it appear so in old people?
Asked by pb_ckt | 15 Feb, 2019, 12:16: PM
answered-by-expert Expert Answer

Blood is always red in colour. Veins appear blue in colour because light has to penetrate the skin to illuminate them.

Veins are full of valves that help keep the blood flowing in the right direction. As people get older, the valves might not function effectively. As a result, some blood stays in a vein instead of moving forward. This makes the vein swell, and that swollen vein is a varicose vein. Varicose veins look twisted and purple or blue.

Answered by Sheetal Kolte | 15 Feb, 2019, 03:18: PM
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