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The endocrine system is made up of a network of glands. These glands secrete hormones to regulate many bodily functions, including growth and metabolism. Endocrine diseases are common and usually occur when glands produce an incorrect amount of hormones.
Endocrine glands produce hormones that can be used inside the body. The endocrine transmits the hormonal messages to cells by secreting them into the blood and extracellular fluid. A receptor is needed in order to receive the message transmitted. The target points may be cells, tissues or organs.