Homeostasis is an important regulatory system that allows organisms to maintain internal stability and metabolic efficiency within variable external environments. Our bodies are constantly being subjected to changes in such things as temperature, air quality, varied foods, sleep and physical exertion to name a few. This program introduces biology students to the phenomenon of homeostasis, why it is important and how it works. The mechanisms for detecting and counteracting changes are explored, along with the roles of the nervous and endocrine systems in maintaining a balance.