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The main contractile system of all muscular tissue are based on the interactions of two proteins Actin and Myosin. The system of these proteins some times called actin-myosin contractile system. Actin is one of the most condensed forms of protein, which is globular and is a monomeric subunit of microfilament. The thin filaments in actin constitute a major part of it.
The myosin head also binds to ATP, which is the source of energy for muscle movement. Myosin can only bind to actin when the binding sites on actin are exposed by calcium ions. Actin molecules are bound to the Z line, which forms the borders of the sarcomere.Other bands appear when the sarcomere is relaxed. A muscle fiber from a biceps muscle may contain 100,000 sarcomeres.The myofibrils of smooth muscle cells are not arranged into sarcomeres.he myosin head also binds to ATP, which is the source of energy for muscle movement. Myosin can only bind to actin when the binding sites on actin are exposed by calcium ions. Actin molecules are bound to the Z line, which forms the borders of the sarcomere. Other bands appear when the sarcomere is relaxed.