A/An __________ is a physician who specializes in diagnosing and treating diseases and malfunctions of the endocrine glands.

endocrinologist

The hormone __________ , which is secreted by cells of the thyroid gland, works with the parathyroid hormone to regulate the calcium levels in the blood and tissues.

calcitonin

The __________ gland secretes hormones that control the activity of the other endocrine glands.

pituitary

The hormone __________ is secreted by the adrenal medulla and stimulates the sympathetic nervous system.

norepinephrine

The condition known as __________ is a complication of hyperparathyroidism in which bones become softened and deformed. They can also develop cysts.

osteitis fibrosa

The condition characterized by abnormally high concentrations of calcium circulating in the blood instead of being stored in the bones is known as __________ .

hypercalcemia

The __________ are mineral substances, such as sodium and potassium, which are normally found in the blood.

electrolytes

A/An __________ is a benign tumor of the adrenal medulla that causes the gland to produce excess epinephrine.

pheochromocytoma

A/An __________ is a reproductive cell. These are sperm in the male and ova in the female.

gamete

The hormone __________ is secreted in response to low blood sugar levels.

glucagon

The hormone __________ is secreted in response to high blood sugar levels.

insulin

The term __________ means excessive thirst.

polydipsia

A/An __________ is the surgical removal of all or part of the pancreas.

pancreatectomy

The term __________ describes an abnormally low concentration of glucose in the blood.

hypoglycemia

An oral ___________ test is performed to confirm a diagnosis of diabetes mellitus and to aid in diagnosing hypoglycemia.

glucose tolerance

The steroid hormones produced by the adrenal cortex are known as __________ .

corticosteroids

__________ syndrome is caused by prolonged exposure to high levels of cortisol.

Cushing's

The hormone __________ influences the sleep and wakefulness portions of the circadian cycle.

melatonin

A/An __________ is a relatively rare life-threatening condition caused by exaggerated hyperthyroidism.

thyroid storm

The hormone __________ , which is secreted by the testicles, stimulates the development of the male secondary sex characteristics.

testosterone