contractile unit of muscle
Each muscle fibre includes myofibrils the contractile units of the cell which are very long chains of sarcomere. Each muscle fiber is surrounded by a thin layer of connective tissue called the endomysium. Chapter 9 Muscles And Muscles Tissue Muscular System Physiology Anatomy And Physiology A part of a muscle that is able to develop tension. . Cell membrane of the muscle cell. Each sarcomere is composed of two main protein filamentsactin and myosinwhich are the active structures responsible for muscular contraction. The myofibril unit which includes numerous bundles of myofilaments and motor neurons the muscle unit made up of numerous motor neurons and a single muscle fiber the motor unit composed of one motor neuron and all the muscle fibers it controls the contractile. As illustrated in Figure 2-5 each sarcomere contains two types of myofilaments. These are the active structures that cause muscle contraction. The contractile unit in a sk...