The correct answer is Parathyroid.Concept:Endocrine Gland:These glands secrete hormones. Hormones are chemical messengers. They are also called ductless glands because they pour their secretions directly into the bloodstream.Explanation:GlandLocationHormonesFunctionsHypothalamus Basal part of the forebrainReleasing hormones Inhibiting hormones Stimulates the secretions of pituitary glandsinhibits the secretion of the pituitary glandPituitary glandAt the base of the brain Growth hormone Prolactin Thyroid-stimulating hormone Luteinizing hormone Follicle-stimulating hormone Melanocyte stimulating hormone Regulates growth of body Regulates the growth of mammary glands and production of milk Stimulates the thyroid gland to release its hormone Stimulates testes in males and ovaries in females to release their hormones Regulates sperm formation in males and stimulates growth and development of ovarian follicle in females Regulates pigmentation of the skin PinealDorsal side of the forebrainMelatoninRegulates circadian rhythm, the biological clockThyroid In the neck (thoracic part) around the windpipeThyroxine/ tetraiodothyronine (T4)triiodothyronine (T3)Regulates the metabolism of carbohydrates, proteins, and fatsParathyroidOn the backside of the thyroid gland (thoracic part)Parathyroid hormone Increases calcium levels in the bloodAdrenalThe anterior part of each kidneyGlucocorticoids Mineralocorticoids Involved in Carbohydrate metabolism Regulate the balance of water and minerals ThymusThe thoracic chamber between the aorta and breast boneThymosins Provides immunity to the bodyPancreasBetween the stomach and small intestine Insulin Glucagon lowers the blood sugar levelraises the blood sugar levelTestesScrotal sac (outside abdomen)Testosterone Production of sperms and development of secondary sexual charactersOvaries In the abdomen Estrogen Progesterone Production of ova and development of secondary sexual charactersmaintenance of pregnancy