What do we call the cell surface membrane of a muscle fibre?
Correct answer: A. Sarcolemma
- A. Sarcolemma
- B. Plasma membrane
- C. Sarcoplasm
- D. Myofibrils
Explanation
'Sarco-' literally means "muscle". This prefix is used in terms of normal cell biology to indicate that the term is related to the muscles. On the other hand, '-lemma' means a "confining membrane"; for example, a normal cell's membrane is simply referred to as the plasma membrane however, a muscle cell's membrane is referred to as sarcolemma hence we reject option B. The cytoplasm of a striated muscle cell is referred to as 'Sarcoplasm' hence we reject option C as well. Myofibrils are made up of sarcomeres, the functional units of a muscle. The function of the myofibril is to perform muscle contraction via the sliding filament model.
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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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