These muscle fibers are composed of myofibrils, which not only give the muscle its striated appearance but also are also composed of contractile proteins known as actin (thin filaments) and myosin (thick filaments). Each actin protein has a binding site for myosin, which is regulated by two proteins known as Tropomyosin and Troponin. Both of these regulator proteins inhibit the binding of myosin to actin by overlapping the binding sites in a confirmation that could be described as a ribbon (Tropomyosin) and a thumbtack (Troponin). Each skeletal muscle is then divided and encapsulated by three difference layers of connective tissue. The first of these layers enclosed the whole skeletal muscle and is known as the epimysium, the second layer of connective tissue called the perimysium encloses each fascicle and finally the last layer of connective tissue which encapsulates each muscle fiber, which is known as the
These muscle fibers are composed of myofibrils, which not only give the muscle its striated appearance but also are also composed of contractile proteins known as actin (thin filaments) and myosin (thick filaments). Each actin protein has a binding site for myosin, which is regulated by two proteins known as Tropomyosin and Troponin. Both of these regulator proteins inhibit the binding of myosin to actin by overlapping the binding sites in a confirmation that could be described as a ribbon (Tropomyosin) and a thumbtack (Troponin). Each skeletal muscle is then divided and encapsulated by three difference layers of connective tissue. The first of these layers enclosed the whole skeletal muscle and is known as the epimysium, the second layer of connective tissue called the perimysium encloses each fascicle and finally the last layer of connective tissue which encapsulates each muscle fiber, which is known as the