These white blood cells are an important part of the immune system. They help your body fight antigens which are bacteria, viruses, and other toxins that make you sick. If your doctor says you have a weakened immune system, that means there aren’t enough white blood cells in your bloodstream.
Lymphocytes and how they work
Cells are produced constantly by the bone marrow and these cells l become lymphocytes.
Some of these lymphocytes will enter your bloodstream, but most will move through your lymphatic system.