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  • The myofibrils are surrounded by a canalicular network of Option: 1 Sarcolemma

The myofibrils are surrounded by a canalicular network of 

Option: 1

Sarcolemma


Option: 2

Sarcoplasmic reticulum


Option: 3

T- tubules


Option: 4

Both b and c


Answers (1)

best_answer

 

 

Structure of Skeletal Muscle -

  • Each organised skeletal muscle in our body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fascia or epimysium.
  • Each muscle bundle or fascicle is surrounded by a perimysium.
  • Each muscle bundle or fascicle contains a number of muscle fibres or myofibers. These are the muscle cells.
  • The myofibres are covered with endomysium.
  • Each myofiber is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm. 
  • The muscle fibre is a syncytium as the sarcoplasm contains many nuclei. 
  • The endoplasmic reticulum, i.e., the sarcoplasmic reticulum of muscle fibres is the storehouse of calcium ions.
  • A characteristic feature of the muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils. 
  • Each myofibril has alternate dark and light bands on it. 
  • A detailed study of the myofibril has established that the striated appearance is due to the distribution pattern of two important proteins – Actin and Myosin. 
  • The light bands contain actin and are called I-band or Isotropic bands, whereas the dark band called ‘A’ or Anisotropic band contains myosin.

Hence the correct option is both b and c.

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Posted by

seema garhwal

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