ENDO = internal
CRINE = secrete a. The endocrine glands are glands of internal secretion (rather than external, as seen with the sweat glands and digestive glands).
b. This internal secretion results from the fact that these glands have no ducts. Thus, they are often referred to as the ductless glands.
c. The secretions produced by the endocrine glands are called hormones.
d. Hormones are carried by the bloodstream to specific organs or tissues, which are then called the target organs.
e. The activity of the target organ, in turn, affects the activity of the endocrine organ. Thus, it is a reverse or feedback mechanism.
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