A white blood cell, also known as a leukocyte or white corpuscle, is a cellular component of the blood that lacks hemoglobin, has a nucleus, is capable of motility, and defends the body against infection and disease.

Why do leukocytes have a nucleus?

Some white blood cells have nuclei that are lobed, or separated into pieces, so they can squeeze through blood vessels more quickly. Other white blood cells act as factories making anti-germ weapons and need big nuclei to store the DNA to make those weapons.

Does a lymphocyte have a nucleus?

The lymphocyte is an agranular cell with very clear cytoplasm which stains pale blue. Its nucleus is very large for the size of the cell and stains dark purple. (Notice that the nucleus almost fills the cell leaving a very thin rim of cytoplasm.) ... These cells play an important role in our immune response.