Do humans have the same blood that we had as a kid? How come blood doesn’t expire inside of us since we range from different temperatures and are exposed to oxygen etc.

Question

Do we somehow maintain the same blood for the rest of our lives and we just pump more if we lose some. Blood expires in hospitals and not when inside of us?

In: Biology

Answer 1

New blood cells are constantly broken down and replaced. They develop in your bone marrow. One of the breakdown products is called bilirubin and is what makes your poop brown.