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Question

Contractile fibrils of muscles are called

A
Neurofibrils
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B
Callogen fibres
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C
Myofibrils
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D
Yellow fibres
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Solution

The correct option is C Myofibrils
  • Each muscle fibre(muscle cell) is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm(cytoplasm of muscle fibre).
  • The characteristic feature of the muscle fibre(muscle cell) is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils.
  • Each myofibril is made up of two kinds of proteins. They are actin and myosin.
  • The function of the myofibril is to perform muscle contraction via the sliding-filament model. Hence Contractile fibrils of muscles are called myofibrils.
  • So, the correct answer is 'Myofibrils'.


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