To understand polycythaemia vera (PV) and its treatment, it can help to know more about your blood and bone marrow. Bone marrow is the spongy material found inside bones. It’s part of the immune system, which protects us from infection and disease. Stem cells are made in the bone marrow. Stem cells are blood cells at their earliest stage of development. All blood cells grow from stem cells.
The three main types of blood cells are:
- red blood cells, which carry oxygen around the body
- white blood cells, which fight infections
- platelets, which help blood clot to stop bleeding.
The bone marrow makes millions of blood cells every day.