<P> The cells of the adaptive immune system are T and B lymphocytes ; lymphocytes are a subset of leukocyte . B cells and T cells are the major types of lymphocytes . The human body has about 2 trillion lymphocytes , constituting 20 -- 40 % of white blood cells ( WBCs ) ; their total mass is about the same as the brain or liver . The peripheral blood contains 2 % of circulating lymphocytes ; the rest move within the tissues and lymphatic system . </P>
<P> The cells of the adaptive immune system are T and B lymphocytes ; lymphocytes are a subset of leukocyte . B cells and T cells are the major types of lymphocytes . The human body has about 2 trillion lymphocytes , constituting 20 -- 40 % of white blood cells ( WBCs ) ; their total mass is about the same as the brain or liver . The peripheral blood contains 2 % of circulating lymphocytes ; the rest move within the tissues and lymphatic system . </P>
where are the cells of the adaptive immune system found
where are the cells of the adaptive immune system found
The peripheral blood the tissues lymphatic system
The peripheral blood the tissues lymphatic system