What are lymphocytes? stress hormones produced by the sympathetic nervous system. harmful agents such as chemicals and viruses that cross the placenta from mother to fetus. white blood cells that are part of the body's immune system. cancer cells that form in the lymph glands?

Lymphocytes are white blood cells that are part of the body's immune system.  

Lymphocytes are types of white blood cells that are part of the body's immune system. The immune system is composed of network of immune cells including lymphocytes that function together to protect the body against foreign substances, such as bacteria or cancer cells that can cause illness and diseases. Lymphocytes are produced in the bone marrow and can be found in the blood and lymph tissue. The two groups of lymphocytes are known as B lymphocytes (B cells) and T lymphocytes (T cells).

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