What is the theory of sliding fibers?
Sliding fiber theory is a model used to explain the mechanism that muscles withdraw. The contraction of skeletal muscle, which is what allows movement, occurs in three ways. The concentric contraction of muscles involves shortening muscle fibers, as in the phase of lifting the bicepine curls, while the eccentric contraction of muscles is made possible by extending muscle fibers, as in the phase of reducing the bicepine curls. Isometric contraction is another possibility during which the muscle does not change the length in maintaining contraction, as in stopping weight in the middle of the bicep curl and holding the elbow to 90 degrees. The theory of sliding fibers describes a process that allows these changes in the length of muscles and hence the contraction of the muscles.
Two types of proteins found in muscle cells, actin and myosin, cooperate on the production of these Contractions because they are arranged in the fibers that walk around them and give the theory of the shiftthe union of the thread its name. In each muscle cell, actin protein chains create passive thin fibers that work in conjunction with strong fibers of myosin, engine or movement protein that produces the strength of muscle contraction. To this end, myosin fibers slipped back and there along the actin fibers inside the unit inside the muscle cell called Sarcomre. Each muscle cell can contain hundreds of thousands of saromers, a structure similar to a zone that extends and contracts as a unit when actin and myosin fibers slide around it. They are sarcoma strips that give their muscles their striped appearance.
As part of the theory of sliding fibers, myosin fibers alternate with actin fibers in horizontal lines, similar to red and white stripes on the American flag. Myosin proteins slide along the actin and release calcium ions that allow the head of each myosin protein to the basket to the Actin fiber. Once myosin ties to actin along these places, similarly IThe Ko crew of the rowers in the skull, which pulled their oar at the same time, Myosin pulls two filaments around him, resulting in the overall shortening of the sarcomer. This collective shortening is made possible by the hydrolysis of adenosine triposphate (ATP), the main source of body energy for many cellular functions and results in muscle cell contraction.
As soon as actin and myosin fibers bind and "stroke", the actin fibers attracts towards the center of the sarcomer, the myosin head separates from the actin, and the ATP will recharge in these filametes, causing another lift of the fibers. If there is no need for muscle contraction and muscle is at rest, a protein called tropomyosin is watched around actin fibers, blocking the binding areas, thus preventing myosin from connecting to the actin to avoid any muscle contraction. The visual fiber steoria also explains how cytokinesis or cell division occurs, and the sliding fiber mechanism causes one cell to clamp into two during mitosis.