When studying the behaviors of rats subjected to long-term stress, Selye noticed all of the following physiological changes except:

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Selye's research on the General Adaptation Syndrome (GAS) primarily identified stress-induced physiological changes such as malfunctioning of the immune system, development of ulcers, enlargement of the adrenal glands, and changes to the thymus, spleen, and lymph nodes. Enlargement of the heart was not one of the changes he noted as a direct result of long-term stress.

When Studying the Behaviors of Rats Subjected to Long-Term Stress