? The main function of endocrine glands is to secrete hormones directly into the bloodstream. Although hormones are chemical substances circulate throughout the body, each type of hormone influences only certain organs and tissues. Some hormones control the function of only one or two entire organs, whereas others have influence throughout the body. Hormones are considered as messengers, controlling and coordinating activities throughout the body. Most hormones are derived from proteins. Others are steroids, which are fatty substances derived from cholesterol.
Substantially, Very small amounts of hormones can trigger very large responses on vital processes as growth and development, reproduction, and sexual characteristics. Hormones also influence the way the body uses and stores energy and control the volume of fluid and the levels of salts and sugar (glucose) in the blood. Hormones serve different functions in the body. The most important include the reduction of inflammation, the control of nerve conduction of signals, and the mediation of receptor binding. Hormones are the pathways through which the nerves deliver impulses received and transmitted by the brain to the rest of the body.
Lacking the proper hormonal balance, an increased level of pain may be experienced or drug therapies including opiates and anti-depressants will never reach their full therapeutic potential. Hormones maintain the blood-brain barrier, the gateway through which blood and medications must flow through in the body.

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