A<unk>  is a type of  white blood cell in the vertebrate immune system. By their appearance under the light microscope, there are two broad categories of<unk> s, namely the large granular<unk> s and the small<unk> s. Functionally distinct subsets of<unk> s correlate with their appearance. Most, but not all large granular<unk> s are more commonly known as the natural killer cells (NK cells). The small<unk> s are the T cells and B cells.<unk> s play an important and integral role in the body's defenses. An average human body contains about 10^12<unk> mphoid cells, and the<unk> mphoid tissue as a whole represents about 2% of the total body weight.
Lymphocyte
Monocyte
Granulocyte
Oocyte
Platelet
Lymphoblast
Plasma cell
Histiocyte