define endocrine systems
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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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The endocrine system is the system of ductless glands, each of which secretes different types of hormone directly into the bloodstream to regulate the body functions like growth, metabolism, and sexual development.
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