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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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Most popular questions from this chapter

The ability of a muscle to generate tension immediately after stimulation is dependent on:

  1. myosin interaction with the M line
  2. overlap of myosin and actin
  3. actin attachments to the Z line
  4. none of the above

Which of the following statements about bone tissue is false?

  1. Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone.
  2. Haversian canals contain blood vessels only.
  3. Haversian canals contain blood vessels and nerve fibers.
  4. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior.

Skeletal muscles can only produce a mechanical force as they are contracted, but a leg flexes and extends while walking. How can muscles perform this task?

Which of the following statements about bone tissue is false?

a. Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone.

b. Haversian canals contain blood vessels only.

c. Haversian canals contain blood vessels and nerve fibers.

d. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior

Botulinum toxin causes flaccid paralysis of the muscles, and is used for cosmetic purposes under the name Botox. Which of the following is the most likely mechanism of action of Botox?

  1. Botox decreases the production of acetylcholinesterase.
  2. Botox increases calcium release from the sarcoplasmic reticulum.
  3. Botox blocks the ATP binding site in actin.
  4. Botox decreases the release of acetylcholine from motor neurons.
See all solutions

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