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why does blood turn brown when it dries

Answer 1: Blood is actually red all the time, but different colors of red. When you see blood outside the body it is usually a dark red. This blood is from the veins. Sometimes you may cut an artery. This blood is bright red. It also spurts out in pulses instead of oozing like the blood from veins. So even outside the body, blood can be different colors. (What's the difference between veins and arteries and why would that affect the color? Why does arterial blood spurt? ) The blood vessels you see at the surface of your skin are veins. Everyone's skin is slightly different in color, so the veins can look different in different people, but blood is exactly the same color in everyone.

It still doesn't look red. That's because we're seeing the *walls* of the veins too. When you see lemon- lime flavored soft drinks in plastic bottles they usually look green, but when you pour them out, they're often clear or yellow. It's not the blood that's bluish; it's the whole vein, including the walls, just like the soft drinks look green because they're in colored bottles. Have you ever seen a totally white rabbit or mouse? They're called "albinos" because they can't make pigments (the substances that color our eyes, skin, and hair).

Their veins look red, even though their blood is the same color as ours. Why is that? Thanks for asking.
Is period blood always red? Caroline* No, not always. It's normal for period blood to be brown as well as red. Our periods are as individual as we are. Blood flow isn't exactly the same every time we have a period, especially for the first couple of years following menarche. Menstrual flow also can look different over the course of the same period. Blood may start out bright red and turn darker red or brown toward the end of the period.

Or blood may start out brown and turn red. And differences in texture, like blood clots and tissue, can happen as the uterus sheds its extra lining. Lots of girls worry about whether their periods are normal. Although differences in menstrual flow are usually nothing to be concerned about, a doctor or nurse can always answer any questions you have. In fact, if your period lasts longer than 7 days or soaks through more than one pad or tampon every 1 2 hours, it's a good idea to talk to a doctor. *Names have been changed to protect user privacy.

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