White blood cells are one of the components of our blood, along with red blood cells, platelets and plasma. Each of these components has a unique function in our body and in medicine.
White blood cells are continuously made in our bone marrow. They have a short lifespan of just one to three days.
The medical term for these cells is leukocytes. There are several different types of cells, including granulocytes, monocytes and lymphocytes.