How do our bodies make blood?

Question

i know that blood cells are made from bone marrow but for example : if i have a cut and i lose lots of blood, will that blood be gone forever or will it be replaced?

Answer 1

Of course not. The bone marrow produces more; it just takes some time.  

Answer 2

that blood can be replaced either by yr body itself or by externally providing blood.(if blood loss is excessive).......

Answer 3

actually it will be replaced..

but it will take time.!

i ll give u an example

suppose u r donating 300 ml of blood to someone,

that blood will get re-generated in 48 hours!

so,the bone marrow is constantly manufacturing blood cells..

drink a lot of water

Answer 4

With bone marrow i think.