During periods of stress, the brain releases cortisol and other stress-related hormones. What impact do these stress hormones have on the immune system?
◦ They kill the T cells, B cells, and NK cells so they can no longer fight infection.
◦ They increase the activity of the white blood cells, which overstimulates the system leading to illness.
◦ They suppress the disease-fighting activity of the T cells, B cells, and NK cells leaving the person more susceptible to illness.
◦ They stimulate antibodies before the B cells can produce them.