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