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