The main function of endocrine glands is to secrete hormones directly into the bloodstream. Hormones are chemical substances that affect the activity of another part of the body (target site). In essence, hormones serve as messengers, controlling and coordinating activities throughout the body.
Upon reaching a target site, a hormone binds to a receptor,...
The Endocrine System
The endocrine system consists of glands or parts of glands whose secretions (called hormones) are distributed in the human body by means of the bloodstream.
The major organs of the endocrine system are the hypothalamus, the pituitary gland, the thyroid gland, the parathyroid glands, the islets of the pancreas, the adrenal glands, the testes, and the...
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