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.
Diagram showing various possible steps in the operation of physiological and behavioral feed-back circuits for the regulation of an animal on a salt deficient diet. Recreated from Richter, L'instinct dans le comportement des animaux et de l'homme (1953).
