The muscular system has a number of key functions to play in our bodies, including locomotion, force application, maintenance of posture, etc. We use our muscles to carry out regular operations such as walking, running, lifting weights, motion, etc. Our muscles are tissues which are fibrous in nature and are composed of proteins, namely actin and myosin. These proteins slide past each other thereby changing the shape and size of the muscle cell and enabling motion.
Therefore, proteins are vital to the muscular system. In fact, the muscular system is made up of proteins and hence cannot function without it. You may have heard that many people drink protein shakes or eat protein bars after heavy exercises in order to support muscle growth. This is because proteins make up the muscles.
Hope this helps.
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