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Muscles enable the heart to beat, the chest to rise and fall during breathing, and blood vessels to help regulate the pressure and flow of blood through the body. When we smile and talk, muscles help us communicate, and when we exercise, they help us stay physically fit and healthy.
This is one of the reasons it needs to be taken  seriously: our bodies were not meant to sustain the emergency state  of high preparedness (fight-or-flight) for long intervals of time!  Something's gotta give.