Lymphocytes are

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

Lymphocytes

A type of white blood cell that plays a central role in the immune response.

Immune System

The body's defense network against pathogens, consisting of organs, tissues, cells, and proteins that identify and eliminate infections.

Stress Hormones

Chemical substances produced by the body in response to stress, such as cortisol and adrenaline, that regulate various bodily functions.