Answer :

Hormone is a substance that directly involve in cellular communication within the human body.

Hormone is a substance that directly involve in cellular communication within the human body.

Explanation:

A hormone is a restrictive substance created in an organism and transported in tissue fluids like blood or sap to stimulate specific cells or tissues into action.

It is a synthetic substance with result thereto of an animal or growth regulator.

It is a person's sex hormones as control to influence behavior or mood.