How do the endocrine and exocrine glands differ in structure and function?

Answer 1

The endocrine system is a control system of ductless glands that secrete chemical "instant messengers" called hormones that circulate within the body via the bloodstream to affect distant cells within specific organs. Endocrine glands secrete their products immediately into the blood or interstitial fluid, without storage of the chemical. Hormones act as "messengers," and are carried by the bloodstream to different cells in the body, which interpret these messages and act on them.
Exocrine glands are glands that secrete their products into ducts. They are the counterparts to endocrine glands, which secrete their products directly into the bloodstream.

you can find detailed description of each system in following web pages

http://en.wikipedia.org/wiki/Endocrine_system
http://en.wikipedia.org/wiki/Exocrine_glands

Answer 2

Exocrine Glands Function

Answer 3

endocrine gland do not have their specific duct system to pour their secretions rather they simply pour their secretions in blood from where it reaches to the organ via flow of blood. there are variable structure and there is no specific trend regarding differentiating b/w endo- and exocrine glands.they basically secretes hormones eg, thymus gland , pancreas , adrenal gland , pituitary gland, etc,
however exocrine gland have their specific ducts and pour their secretions directly to the target organ through well vascularised tubules with sphincters.they basically secretes enzymes and other proteins eg, pancreas , liver , etc

pancreas is the only gland which is both endocrine and exocrine