It is a long cylindrical cell with multiple oval nuclei arranged just beneath its sarcolemma:
Correct answer: A. Muscle fibre
- A. Muscle fibre
- B. Cardiac fibre
- C. Muscle bundles
- D. Myofilament
Explanation
Option A is correct.A muscle fiber is a long, cylindrical cell that is the basic unit of skeletal muscle tissue. It is made up of many smaller cells that have fused together. Each muscle fiber has multiple nuclei, which are located just beneath the cell membrane, called the sarcolemma. Muscle fibers are very long and can be up to several centimeters in length. They are also very thin, with a diameter of only about 10 micrometers. This allows them to be packed together tightly in muscles, which gives muscles their strength and power. Muscle fibers are also very specialized for contraction. They contain proteins called actin and myosin, which form the contractile units of the muscle cell. When actin and myosin filaments slide past each other, they cause the muscle fiber to contract.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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