Inam Joudah Radhi Department of Chemistry, College of Education for Pure Sciences, University of Karbala, Iraq. Abstract: Chemicals known as hormones are released by the endocrine glands and circulated to the intended organ. It controls how well organs behave and function. In reaction to variations in light, the pineal gland in the brain releases the hormone melatonin. Keywords: Hormone, Melatonin, ...

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