Bone Marrow (Main Site):
Found in large bones like the pelvis, spine, ribs, sternum, and thigh bones.
It produces all types of blood cells:
Red blood cells (RBCs) – carry oxygen
White blood cells (WBCs) – fight infection
Platelets – help with clotting
Hematopoietic Stem Cells (HSCs):
Inside the bone marrow are special cells called hematopoietic stem cells.
These stem cells can develop into any type of blood cell, depending on what the body needs.
How it works:
The body constantly monitors blood levels.
When more blood cells are needed (like after blood loss or during infection), signals are sent to the bone marrow to increase production.
Bonus Fact:
In fetuses, blood is first made in the liver and spleen, but after birth, the bone marrow takes over as the main production site.
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