Testo Genix XL The viscous fluid (synovial) released into the cavity of the joint by the inner layers of the tissues of the particular sac reduces friction between the contacting surfaces of the bones. Thanks to strength exercises, the strength of joints is increased, they become more mobile. However, with extreme (excessive) load and a considerable excess of the degree of freedom, injuries are likely - sprains, sometimes even with a rupture of tissues and blood vessels. Thanks to the contractile activity of more than six hundred skeletal muscles, a person performs all movements. There are two types of muscles - smooth, contracting apart from the will (the stomach, the walls of blood vessels), and striated, moving the body in space, due to muscle-controlled muscle contraction. The striated muscle consists of thin threads of acting protein and thick threads of myosin, which, when combined, form sarcomeres — elementary motor units, where chemical energy is converted into mechanical energy, causing movement of a person. There is an assumption that the contractile process of the muscle occurs as a result of the mutual penetration of acting and myosin filaments. In this regard, the energy level of the macromere depends on the position of these threads in it. Combining into groups, sarcomeres form more than a thousand thin filaments - fibrils, of which the muscle fiber consists. The fibers form muscle bundles, and those, joining together, the muscle itself. The contractile muscle fibers terminate in connective tissue, which passes into the tendon and transfers stress while contracting. Connective tissue has high strength. Almost all the wide muscles are located on the body, long - mostly on the limbs, short - between individual vertebrae. Visually, long muscles look like spindles. 

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