Hormonal system (endocrine)
Hormones are like chemical messages that control our body's growth, repair and reproduction. Organs of the hormonal or endocrine system include the pituitary, adrenal, thyroid and parathyroid glands and the ovaries, pancreas and testes.
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Topic: Introduction to the hormonal system
Hormones can be thought of as chemical messages that communicate with the body and bring about changes.