Blood cell formation - Bone Marrow & Hematopoiesis || 2 mins

Where Do Blood Cells Come From? The Production - The blood cells are made in the bone marrow and the process of making blood cells is called hematopoiesis.

Bone marrow is a spongy tissue located inside some bones. It contains young parent cells called stem cells. These blood-forming stem cells can grow into all 3 types of blood cells – Red blood cells, White blood cells and Platelets.

When blood cells are fully mature and functional, they leave the bone marrow and enter the blood. Healthy people have enough stem cells to keep making all the blood cells they need every day.

In the foetus, blood cells are produced by the bone marrow, liver, spleen and thymus. This changes during and after birth. The liver stops producing blood cells around the time of birth, while the spleen stops producing them soon after birth but continues to produce lymphocytes for life.

From infancy onwards, blood cells are produced in the bone marrow. Bone marrow produces 200 billion new red blood cells every day, along with white blood cells and platelets. Lymphocytes are additionally produced in lymphoid tissues and organs like thymus, tonsils, lymph nodes, spleen and patches of lymphoid tissues in the intestine.

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