The muscular staple fibres
Individual muscular staple fibres are formed during the development of the fusing of some immature undifferentianted cells known as myoblasts in length, cylindrical, multi-nucleadas cells. Differentiation for this state essentially is concluded before the birth with the cells continues to grow in size later. The skeletal muscle shows a standard of distinct bands when seen under the microscope, which had to the arrangement of the elements of cytoskeletal in the cytoplasm of muscular staple fibres. The proteins are main cytoplasmic miosina and actina (also known as “thick” and “I finish” filaments, respectively) that they are made use in a unit of repetition called sarcomere. The interaction of actin and myosin is responsible for the muscular contraction.

It has two main ways to classify muscular staple fibres: the type of miosina (fast or slow) present, and degree of oxidativa fosforilation that suffers from fiber. The skeletal muscle can thus be divided in two great categories: type I and type II. staple fibres type I appear in red due to presence of the myoglobin protein vinculativa oxygen. These staple fibres are adjusted for the resistance ea fatigue are slow, therefore they use the oxidative metabolism to generate ATP. staple fibres of type II are white, due to absence of myoglobina and glycolytic enzyme dependence. These staple fibres are efficient for small explosions of speed and use of energy and metabolism the oxydative and anaerobic metabolism, depending on the particular subtype. These staple fibres are faster to the fatigue.