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The endocrine system includes all of the glands of the body and the hormones produced by those glands. The glands are controlled directly by stimulation from the nervous system as well as by chemical receptors in the blood and hormones produced by other glands. By regulating the functions of organs in the body, these glands help to maintain the bodyâs homeostasis.
Most hormones in the human body are produced by organs called ductless glands (endocrines). These include the two adrenal glands, the pituitary gland, the four parathyroid glands, the sex glands, and the thyroid gland.arious endocrine glands secrete hormones into the blood, which carries them throughout the body. When a hormone arrives at its target organ or tissue it causes certain actions to take place. Hormones may be grouped according to the functions they control.