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...Thermoregulatory contains receptors sensitive to the temperature centre of blood glucose concentration skin sends nervous e impulses g body n these automatic a h control systems c l may involve vessels dilate vasodilation too sweat produced from ht thermal energy is lost r high glands t responses or near surface x hypothalamus chemical evaporates transferring d water levels constrict regulation internal conditions vasoconstriction sweating stops low loss at cell organism maintain optimum muscles contract shivering reduced respiring for function cells transfer i o human endocrine system biology only homeostasis maintains optimal s carries enzyme action and all functions composed hormone target p pineal which aqa gcse pituitary organ where produces gland secrete chemicals an effect compared called hormones thyroid directly into effects are slower but act response bloodstream longer nitrogen balance part thymus adrenal master stimulates other pancreas secretes several produce v exhaled u ...