““Selye discovered that the biology of stress predominantly affected three types of tissues or organs in the body: in the hormonal system, visible changes occurred in the adrenal glands; in the immune system, stress affected the spleen, the thymus and the lymph glands; and the intestinal lining of the digestive system. Rats autopsied after stress had enlarged adrenals, shrunken lymph organs and ulcerated intestines. All””