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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.
1 Support: Our bones provide the rigidity we need to function. 2  Protection: The rigidity of our bones allows them to protect our internal organs from damage for example the rib cage and the skull.  Movement: Without the strength of our bones we wouldnt be able to move our muscles are anchored to our bones.