ELI5, how does a bone marrow transplant work?

Question

From what I understand most bones have marrow, therefore how does a transplant work if it is throughout your body?

In: Biology

Answer 1

A bone marrow transplant takes a donor’s healthy blood-forming cells and puts them into the patient’s bloodstream, where they begin to grow and make healthy red blood cells, white blood cells and platelets. Patients receive high doses of chemotherapy to prepare their body for the transplant.