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