ICSE Class 10 Answered
Why is blood dark red when taken from a vein?
Asked by Latha | 25 Sep, 2017, 07:29: PM
Expert Answer
Because of their thinner walls, veins tend to be larger than the artery in the area, so they hold more blood, making collection easier and faster. When blood is deprived of oxygen, it turns dark red. When it’s oxygenated, it turns a brighter red. This red color primarily comes from the hemoglobin, which contains four heme groups. These heme group’s interactions with various molecules end up giving it the dark red or light red colour.
Answered by Sivanand Patnaik | 26 Sep, 2017, 08:49: AM
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