What internal changes happen to the body during exericse?

During exercise, homeostasis keeps the blood glucose concentration, body temperature and water levels constant. Glucose is used in respiration to produce energy. This causes the blood glucose concentration to drop, so increased glucose is supplied from the liver and kidneys. During exercise body temperature also rises, so to keep the body's internal temperature constant, heat is lost through sweating. And as water is lost water levels are kept constant by the kidneys that conserve water to prevent dehydration.