The Ductless Glands
There are certain organs which are very similar to secreting glands, but differ from them in one essential particular, viz., they do not possess any ducts by which their secretion is discharged.
ductless glands that produce internal secretions from materials brought to them by blood, and whose secretions are carried away by the blood
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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The endocrine glands are ductless glands and secrete hormones directly into the blood vessels nearby. The hormones are then carried throughout the body and act upon target cells and tissues.
endocrine A system of ductless glands secreting hormones into the bloodstream and targeting another organ to produce a response.
endocrinology The study of the endocrine system and its role in the physiology of an animal.
The internal system of chemical communication involving hormones, the ductless glands that secrete hormones, and the molecular receptors on or in target cells that respond to hormones; ...
Endocrine Gland one of the ductless glands which secretes hormones
(endo = within‚ inner; crin = separate) ...
 See also: Membrane, Organ, Human, Blood, Class
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