The Only Endocrine Gland That Stores Its Hormone Product Extracellularly

Question

The only endocrine gland that stores its hormone product extracellularly is the ________.
A) pancreas
B) parathyroid
C) thyroid
D) pituitary
E) ovary

Accepted Answer

The thyroid gland stores its hormone product, thyroxine, extracellularly in the colloid of the thyroid follicles. No other endocrine gland stores its hormone product in this way. The pancreas secretes insulin and glucagon into the bloodstream, the parathyroid gland secretes parathyroid hormone into the bloodstream, the pituitary gland secretes its hormones into the bloodstream, and the ovaries secrete hormones into the bloodstream as well.