White blood cells defend the body against disease and are comprised of lymphocytes and phagocytes. Phagocytes engulf and digest waste, bacteria, and foreign bodies to provide innate immunity as the body's first line of defense, while lymphocytes are smaller white blood cells that produce antibodies and aid immune responses to fight infection. The nucleus of lymphocytes is larger than in phagocytes, whose nucleus is lobed.

1. White Blood Cells
Lymphocytes and Phagocytes

2. The white blood cells defend us against disease. There are far
fewer of them than red blood cells
Structure
The nucleus of the lymphocyte is larger and the nucleus of the
phagocyte is lobed

3. Phagocytes
Phagocytes engulf and digest waste material and bacteria.
They are big cells responsible
for the innate immunity: they are
the first line of defence of the
body, and act "by eating" the
foreign bodies
http://www.youtube.com/watch?v=CEOV-SFTlpY

4. Lymphocytes
Lymphocyte is a smaller white blood cell that serves to
fight infection along with immune responses in the
body, producing antibodies
-They make them stick together.
-They dissolve their cell
Membranes.
-They neutralise the toxins.
http://www.youtube.com/watch?v=cD_uAGPBfQQ