They are organic chemical substance(usually proteins or steroids).hormones are secreted by ductless and endocrine glands directly into the blood stream
Hormones performs several biological functions such as;
Insulin for lowering blood glucose concentration
Anti-diuretics hormone, ADH for promoting reabsorption of water in the kidney
Gastric stimulate the secretion of gastric juice etc. The name is derive from a Greek word meaning it arouses to activity
Each hormones has its own target cell on which it acts; therefore each has its own specific effect on the body
Hormones are often effective in very small concentrations
Most hormones are either excreted in the urine or broken down by enzymes quite quickly.
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