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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.
Why do we need 3 different kinds of muscles? Due to the complexity of the human body, three different types of muscle fibers are deemed necessary. A primary characteristic the three types of muscle tissues share is the ability to contract.