Cortisol and the HPA axis operate a complicated negative feedback system to control the stress response with hormones like adrenaline, and also to bring it quickly back into balance once the stress or threat has subsided. (nuzest.com)
The pill uses the body's negative feedback system to prevent ovulation and implantation of an embryo, in the same way the hormones provided by the placenta halt the female cycle during pregnancy.» (religion.blogs.cnn.com)
This negative feedback system may make ending judicial elections difficult. (politics.stackexchange.com)