How Do Blood Cells Leave The Bone Marrow? A platelet can live from 5-9 days before it dies and is replaced by a new one. A white blood cell can live up to 150 days before it dies and is replaced by a new one, though some lymphocytes may live for years if they become a memory cell. The platelets help clotting, healing and recovery when we are injured.Ī red blood cell can only live about 120 days before it dies and is replaced by a new one that is made in the bone marrow. The white blood cells include monocytes and granulocytes, which mediate the inflammatory response, and lymphocytes (T cells, B cells and natural killer cells) which are the key components of our adaptive immune system. They transport oxygen throughout our body.

The red blood cells are the most numerous of all of the blood cells. Red bone marrow is found in the cavities of the spongy bone, and also in the outer layers of the medullary cavity, surrounding the yellow bone marrow. Yellow bone marrow is located in the medullary cavity, which is enclosed within the endosteum: the inner bone surface consisting of endothelial cells and fibroblasts. Where Is The Bone Marrow Located? Donna Adams, Pinterest

The bone marrow is a vital organ for our bodies, because it produces over 30 billion red blood cells and 20 billion white blood cells that circulate through our system each day. The average adult has around 3-4 litres of bone marrow inside their bones, depending on age and gender. Red bone marrow makes blood cells and stores blood platelets, while yellow bone marrow stores fat and produces cartilage, fat and bone. Yellow bone marrow is located in the centre of long bones like the femur, often surrounded by a layer of red marrow. Red bone marrow is found primarily within flat bones like the sternum and is the main focus of this article. The second is that there are two types of bone marrow. The first is that it is located in holes within the bones called marrow cavities. There are two things that are important to know about bone marrow.

Bone marrow is an encapsulated bundle of stem cells that lies in the centre of certain bones.

Define flat bones