Why does blood turn brown when it dries?

Question

I cut myself yesterday by punching a glass (I don’t know why I did it) and after watching the shit I did I put a bandage on, and that question popped into my head.

In: Biology

Answer 1

When the blood breaks down in the environment outside the body, the oxygen concentration is reduced and the plasma, which is mostly water, by concentration, is released. Therefore, the blood is not as red and not as bright – thus it appears brown.