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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.
There are important reasons why muscle is muscle and bone is bone. Sometimes you need flexibility and strength. Other times you need hardness and structure. In a rare condition called fibrodysplasia ossificans progressiva (FOP), this system breaks down. Your bodyâs soft tissues -- muscles, ligaments, and tendons -- turn into bone and form a second skeleton outside your normal one.