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White blood cells Refers to a blood cell that does not contain hemoglobin. White blood cells are made by bone bone marrow and help the body fight infection and other diseases, as part of the immune system. White blood cells are sometimes called leukocytes, are a key part of the body's system for defending itself against infection. They can move in and out of the bloodstream to reach affected tissues. The blood contains far fewer white blood cells than red cells, although the body can increase production of white blood cells to fight infection. There are several types of white blood cells, and their life spans vary from a few days to months. New cells are constantly being formed in the bone marrow.
Some
have the ability to change with needs and situations in the body.
So, for example, there are different monocytes found in different
tissues, and different types of lymphocytes with different roles
in fighting infections. These cells can leave the bloodstream,
sliding out through the vessel walls and attacking invaders at
the site of an infection. |