How does your body restore blood?

Question

When you cut yourself or something bad happens where you bleed alot, how does your body replace that blood that was lost? And also, is some of the same blood in your body your whole life? because you never lose all your blood. Or does your body somehow get rid of that blood and always restore/make new?

Answer 1

it is produced in your bone marrow. you constantly regrow everything in your body. your blood cells die and are put out through your waste system, when your blood is filtered in your kidneys/liver.

Answer 2

Bone marrow. its that simple. red blood cells are created when heme groups break down from hemegloblin. the iron form the hemeglobin is then sent to the bone marrow where it make RBC, or red blood cells

Answer 3

Bone marrow makes red blood cells.

Answer 4

Red blood cells are made in the bone marrow. They start out with a nucleus, like other cells, but when they fill up with hemoglobin the nucleus is squished smaller and smaller until it disappears. With no nucleus, red blood cells are fragile and live only about 120 days. In your body, about 2 million red blood cells die per second! But your bone marrow produces new ones just as fast.