Question

why blood comes out when we had a wound​

Answer 1

Blood helps clean the area. Blood vessels open in the area, so blood can bring oxygen and nutrients to the wound. Oxygen is essential for healing. White blood cells help fight infection from germs and begin to repair the wound.
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Answer 2

Answer:

Explanation:

When your skin is cut or scraped, you begin to bleed. This is because blood vessels in the area are damaged. Bleeding serves a useful purpose because it helps to clean out a wound. ... Abdominal and chest wounds can be quite serious because internal organs may be damaged, which can cause internal bleeding as well as shock.

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