Bone marrow is the flexible tissue found in the interior of bones. In adults, marrow in large bones produces new blood cells which helps the body to fight disease.
On average, bone marrow constitutes 4% of the total body mass of humans.
Stem cells in this bone marrow produce three important types of blood cells:
Red blood cells – which carry oxygen around the body.
White blood cells – which help fight infection.
Platelets – which help stop bleeding.
Diseased or damaged bone marrow can be replaced by donated bone marrow, which helps treat, and often cure, many serious, life-threatening conditions, including:
Bone marrow failure -(severe aplastic anaemia).
Leukaemia – cancer of the white blood cells, which has several sub-types. It can also help cure certain genetic blood.
Certain immune system disorders such as sickle cell anaemia, thalassaemia and some severe immune system diseases.
More top news
For thousands of families, today is the day they find out whether their 11-year-olds will go to the secondary school of their choice.
A dangerous "charmer" who murdered his girlfriend over an obsession she was having an affair on Facebook has been sentenced to life.
EastEnders star Danny Dyer is set to marry his long-term girlfriend after she proposed to him ... and Katie Hopkins isn't happy.