The momenta of individual objects changes. The total momentum remains constant. I have to disagree. If you have two cars that collide head on, the momentum of both vehicles stops. The ENERGY created by the impact causes usually, some reverse momentum but the momentum is lost.
As the SNS continues to trigger physical reactions, it causes a wear-and-tear on the body. It's not so much what chronic stress does to the nervous system, but what continuous activation of the nervous system does to other bodily systems that become problematic.
HomeFacial Sweating and Blushing. Another manifestation of a hyperactive sympathetic system is excessive facial sweating and/or facial blushing. Such symptoms of hyperhidrosis will typically appear during mild social encounters that would otherwise not have caused facial sweating and/or blushing.