Which of the Following is Not True of True Hormones

Question

Which of the following is not true of true hormones?
A)Each hormone can only influence target cells that contain receptors for it.
B)They are secreted by both endocrine or exocrine glands.
C)Some hormones influence the rates of chemical reactions in their target cells.
D)Some hormones regulate water and electrolyte balance.
E)All of these are true of true hormones.

Accepted Answer

True hormones are only secreted by endocrine glands, not exocrine glands. Exocrine glands secrete their products into ducts that lead to body surfaces (e.g. sweat glands, salivary glands), while endocrine glands secrete their products directly into the bloodstream to exert their effects on target cells throughout the body.