Skeletal Muscle Structure and Function Quiz

<p>Generating the force for muscle contraction</p> Signup and view all the answers

<p>Surrounding individual muscle fibres</p> Signup and view all the answers

<p>Skeletal muscle fibres are formed by the fusion of undifferentiated myoblast cells, resulting in a single cylindrical, multinucleated cell. They range in diameter from 10-80 μm and may be more than 35cm long. Each muscle fibre is surrounded by a plasma membrane called the sarcolemma.</p> Signup and view all the answers

<p>Each skeletal muscle fibre contains several hundred to several thousand myofibrils, which are rod-like structures running the length of the muscle fibres. Myofibrils appear as long strands of smaller subunits called sarcomeres, which are the smallest functional units of muscle.</p> Signup and view all the answers

<p>Sarcomeres are the smallest functional units of muscle, composed of filaments of actin and myosin. They are joined end to end at the Z line within myofibrils.</p> Signup and view all the answers

<p>Myofilaments, including actin and myosin, are responsible for muscle contraction. Actin forms thin filaments, while myosin forms thick filaments folded into a globular head at one end, consisting of twisted strands of heavy and light portions.</p> Signup and view all the answers

<p>Myofilaments are arranged in series from one sarcomere to another and in parallel within a myofibril, with approximately 6000 sarcomeres end to end in a myofibril with a length of 15mm.</p> Signup and view all the answers