The endocrine system only regulates long-term changes in the body.

This statement is not entirely accurate. While the endocrine system is responsible for regulating long-term changes in the body, it also plays a vital role in short-term changes, such as regulating blood sugar levels, responding to stress, and controlling fluid and electrolyte balance in the body. Hormones released by the endocrine glands can have both short-term and long-term effects on various physiological processes in the body. Therefore, it can be said that the endocrine system regulates both short-term and long-term changes in the body.