define endocrine glands
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The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In humans, the major endocrine glands are the thyroid gland and the adrenal glands.
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A gland which do not have a duct or tube and secrets its product directly into blood stream is called endocrine gland. They make a chemical substance called hormones.
For eg.- Pituitary gland, thyroid gland, adrenal gland etc.
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