What are hormones? Give examples.

Explanation

(i) Hormone is an organic substance (e.g. a peptide or a steroid) that is secreted by one tissue into the blood stream and induces a physiological response (e .g. growth and metabolism) in other tissues.
(ii) It is an intercellular signalling molecule. e.g. insulin, epinephrine.
(iii) Hormones are classified into Endocrine, Paracrine and Auto.crine hormones.