why the peoples' veins are blue color from outside, but the blood comes out is RED?
回答 (6)
2006-10-03 9:24 am
✔ 最佳答案
Our blood is actually a very dark red color. It appears blue in our veins because of our skin, that and blood doesn't reflact light very well, which gives it its blue color.
2006-10-03 10:21 am
Oxygenated blood is bright red. Arterial blood is bright red. What is closer to the skin is vein which has blood that is being taken to the heart to be oxygenated. (therefore has less oxygen content) so is not bright red. Add two layers of skin....and you see blue.
of course, there are the blue blooded ppl who have blue blood :)
of course, there are the blue blooded ppl who have blue blood :)
2006-10-04 9:28 pm
OXYGEN!!!!!
2006-10-03 9:32 am
Blood is blue, when it gets oxygen from your system it picks up that "dark red, nearly blue" color. When you bleed, it is exposed to a much larger amount of oxygen outside your body and turns red rapidly.
2006-10-03 9:24 am
Blood actually gets its red color from oxygen. I believe that the veins carry blood without oxygen and the arteries carry blood with oxygen--thus the different colors. Once blood gets outside the body for whatever reason and oxygen hits it, it turns red.
2006-10-03 9:21 am
I dont know how true it is but I heard that blood is red when we cut ourself because it reacts with the air. I'm reading that and it doesn't sound true but that's what I heard.
收錄日期: 2021-04-22 23:36:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061003011832AAYUzAM