Q 01/05

Endocrine glands release their hormones directly into what?

A) The bloodstream

B) Ducts

C) The digestive tract

D) The skin surface

Answer · why

A) The bloodstream

That is the difference from exocrine glands like salivary glands, which use ducts.

Q 02/05

Which brain region is the neural control center for the endocrine system in vertebrates?

A) Cerebellum

B) Hypothalamus

C) Medulla oblongata

D) Hippocampus

Answer · why

B) Hypothalamus

It links the nervous system to the endocrine system through the pituitary gland just below it.

Q 03/05

What is the study of the endocrine system and its disorders called?

A) Hematology

B) Nephrology

C) Endocrinology

D) Immunology

Answer · why

C) Endocrinology

It is a branch of internal medicine.

Q 04/05

Which of these hormones is secreted by the thyroid?

A) Melatonin

B) Growth hormone

C) Testosterone

D) Thyroxine

Answer · why

D) Thyroxine

Thyroxine is T4; the gland also makes T3 and calcitonin.

Q 05/05

Which hormone does the pineal gland secrete?

A) Melatonin

B) Thyroxine

C) Cortisol

D) Glucagon

Answer · why

A) Melatonin

The pine-cone-shaped gland sits near the center of the brain and helps set the sleep-wake cycle.