An official website of the United States government.

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

Concept Breadcrumbs

Preferred Term:


Chemical substances having a specific regulatory effect on the activity of a certain organ or organs. The term is applied to substances secreted by various endocrine glands and transported in the bloodstream to the target organs, and is also extended to include those substances that are not produced by the endocrine glands but that have similar effects.
Concept Schemes:
Entry Terms:
  • animal hormones
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2015-01-30