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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.
1.1 Why are proteins important to us. Proteins make up about 15% of the mass of the average person. In addition to these large scale structures that hold us together, smaller protein molecules play a vital role in keeping our body working properly.