Metabolic changes usually occur within the enzymatic system that is concerned with the regeneration of high-energy compounds, especially ATP. These fibers contract relatively slowly and have the ability to maintain contraction for a long time. There is no ordered system of myosin filaments in smooth muscle cells. Mer från den är utvecklaren Visa alla. These bands are dependent upon the arrangement of the two sets of sliding filaments and the connections between them. Familjedelning Upp till sex familjemedlemmar kan använda den här appen när Familjedelning är aktiverat. Striated muscles are richly supplied with the nerves by which muscular activity is regulated from the nerve centers.
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Such fibers contract so slowly that even at very low frequencies of stimulation, individual waves of contraction superimpose and merge to produce a single, prolonged contraction.
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The contraction of muscles that are located between bony prominences and the skin changes the shape of the skin surface. For example, the hip is flexed at the hip joint by the iliopsoas and extended by the gluteus maximus. Presumably, cardiac muscle evolved as a specialized type from the general smooth muscle of the circulatory vessels. The transverse striations of skeletal muscle form a characteristic pattern of light and dark bands within which are narrower bands. Smooth muscle is usually arranged in sheets or layers, commonly oriented in different directions. A radial muscle, on the other hand, widens the opening when it contracts. Muscles enable animals and man to perform very important physiological functions, such as movement of the body or its individual parts, blood circulation, respiration, passing of chyme through the digestive organs, maintenance of vascular tonus, and excretion.