The Science of Muscle Growth Muscle growth, also referred to as hypertrophy, is the development of mass, shape, function, and density of muscle cells. This adaptation is what allows your muscles to handle exercise-induced distress. Muscles are made up of many fibers: cylindrical bundles of filaments called sarcomeres. They are the fundamental units behind muscular contractions and are made up of actin and myosin. These proteins comprise approximately 20% of your muscles. The other 80% are made up of water, phosphates, and minerals. When you break it down physiologically, each cell of muscle fiber is supported by other groups of cells. These wrapped bundles of cells wrap on top of one another, with fibers in between and blood vessels surrounding each one. The epimysium grows in between these groups of fibers and around the entire muscular structure and is what becomes fused with the tendon. This is either the fixed attachment or the movable attachment depending upon its origin. Further...
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