Each muscle fiber is surrounded by a modified cell membrane called:
Correct answer: A. Sarcolemma
- A. Sarcolemma
- B. Sarcoplamic reticulum
- C. Sarcomere
- D. Myofilament
Explanation
The sarcolemma is the term used to describe the specialized cell membrane that surrounds each individual muscle fiber (also known as a muscle cell or myofiber). It is a modified plasma membrane that separates the intracellular contents of the muscle fiber from the extracellular environment. The sarcolemma is essential for maintaining the integrity and function of the muscle fiber, as it controls the movement of ions and molecules into and out of the cell, thereby regulating muscle cell excitability and contraction.
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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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