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Chapter 38: Q. 21 (page 1120)

The cell membrane of a muscle fiber is called a ________.

  1. myofibril
  2. sarcolemma
  3. sarcoplasm
  4. myofilament

Short Answer

Expert verified

The correct answer is option (b)

Sarcolemma is the name of a muscle fiber's cell membrane.

Step by step solution

01

 Sarcolemma 

  • The sarcolemma, which is the muscle cell's plasma membrane, is encircled by endomysia connective tissue and basement membrane.
  • The sarcolemma is a membrane that is reactive and has several characteristics in common with the membrane of neuronal cells.
02

Step: 1 Explanation for Correct answer  

  • Sarcolemma and sarcoplasm are the names of the cytoplasm and membrane, respectively, of muscle cells.
  • Due to their lengthy, cylindrical structure, muscle cells are also referred to as muscle fibres. A glycocalyx covers the sarcolemma. Thus, the option b is correct.
03

Step: 2 Explanation for incorrect answer 

  • A myofibril is a fundamental rod-shaped organelle of a muscle cell, sometimes referred to as a muscle filament or sarcostyle. So, option a is wrong.
  • A muscle fiber's cytoplasm is called sarcoplasm. So, option c is wrong as well.
  • The three protein filaments that make up myofilaments are found in muscle cell myofibrils. Myosin, actin, and titin are the three major proteins involved. Hence, option d is wrong too.

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