Question : Give information of endocrine glands and hormones.

1.	Question : Give information of endocrine glands and hormones.
Answer» Solution :Endocrine glands are ductless glands and their secretions are CALLED hormones. The classical definition of hormone is, they are PRODUCED by endocrine glands, released into the BLOOD and transported to a distantly located target organ. The current scientific definition is as follows - Hormones are non - nutrient chemicals which ACT as intercellular MESSENGERS and are produced in trace amounts. The new definition covers number or new molecules in addition to the hormones secreted by the organised endocrine glands. Invertebrates possess very simple endocrine systems with few hormones whereas a large number of chemicals act as hormones and provide coordination in the vertebrates.

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