what is bone marrow?. why is it important for us
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Bone marrow is a spongy substance found in the center of the bones. It manufactures bone marrow stem cells and other substances, which in turn produce blood cells. Each type of blood cell made by the bone marrow has an important job. Red blood cells carry oxygen to tissues in the body.Bone marrow is a semi-solid tissue found within the spongy or cancellous portions of bones. In birds and mammals, bone marrow is the primary site of new blood cell production or haematopoiesis. It is composed of hematopoietic cells, marrow adipose tissue, and supportive stromal cells.
The bones of the skeletal system serve many important functions for the body, from giving your body support to allowing you to move. They also play an important role in blood cell production and fat storage.
Bone marrow is the spongy or viscous tissue that fills the inside of your bones. There are actually two types of bone marrow:
Red bone marrow helps produce blood cells
Yellow bone marrow helps store fat.
Read on to learn more about different functions of red and yellow bone marrow as well as the conditions that affect bone marrow.Red bone marrow is involved in hematopoiesis. This is another name for blood cell production. Hematopoietic stem cells that are found in red bone marrow can develop into a variety of different blood cells, including:
Red blood cells. These are the cells that work to carry oxygen-rich blood to the cells of the body. Old red blood cells can also be broken down in red bone marrow, but this task is mostly performed in the liver and spleen.
Platelets. Platelets help your blood clot. This prevents uncontrolled bleeding.
White blood cells. There are several types of white blood cells. They all work to help your body fight off infections.
Newly produced blood cells enter your bloodstream through vessels called sinusoids.
As you age, your red bone marrow is gradually replaced with yellow bone marrow. And by adulthood, red bone marrow can be found only in a handful of bones, including the:
skull
vertebrae
sternum
ribs
the ends of the humerus (upper arm bone)
pelvis
the ends of the femur (thigh bone)
the ends of the tibia (shin bone)
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