Memory The Endocrine SystemVersión en línea Review the organs of the endocrine system and their functions. por Kathy Dilliplane Thyroid Produces melatonin to regulate sleep cycles Regulates growth and metabolism Regulates blood sugar levels Increase heart rate during a "Fight or Flight" response Regulate the male reproductive system Regulates calcium levels in the blood. Testes Pituitary Adrenal Glands The body's "Master Gland" that controls the other endocrine organs. Regulates the female reproductive system Pineal Gland Helps the immune system recognize and fight pathogens Parathyroid Glands Thymus Ovaries Pancreas