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Define hormone. Write any four character...

Define hormone. Write any four characteristics of hormones in humans.

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Hormones are the chemical substances which co-ordinate and control the activities of living organisms and also their growth.
Characteristics of hormones are :
(i) They are chemical messengers
(ii) Regulate behaveour of target cells.
(iii) They stimulate the teraget organs.
(iv) They are proteinaceous or non - proteinaceous in nature.
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