Question

Contractile fibrils of muscles are called

• A. Neurofibrils
• B. Callogen fibres
• C. Myofibrils
• D. Yellow fibres

Answer 1

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'.