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Human Body Study

Bone Marrow

The soft tissue inside bones — the body’s blood-cell factory.

The lymphatic and immune system A stylised body with the lymphatic organs placed at their anatomical positions, plus two concept panels for the functional arms — innate immunity (phagocytes eating pathogens) and adaptive immunity (lymphocytes and antibodies). Each label links to the article for that part. Innate immunity fast frontline: phagocytes ingest pathogens Adaptive immunity specific and remembered: lymphocytes and antibodies Tonsils Thymus Lymph nodes Spleen Lymphatic vessels Bone marrow Lymphatic organs and lymph vessels, plus the two arms of the immune response — schematic.

What it does

Section titled “What it does”

Produces all blood cells from stem cells: red cells, platelets, and white cells (including the lymphocytes central to immunity). It is also where B lymphocytes (B cells) mature.

Immune role

Section titled “Immune role”

The source of every immune cell, and the maturation site for B cells.

Key idea

Section titled “Key idea”

Bone marrow is shared ground between the skeletal, cardiovascular, and immune systems — the single origin of all blood and immune cells.