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  • The length of the sarcomere is aboutOption: 1 micron<

The length of the sarcomere is about

Option: 1

2-3 micron


Option: 2

0.1-0.9  micron


Option: 3

3-10 micron


Option: 4

10 micron


Answers (1)

best_answer

 

 

 

Sarcomere -

  • The smallest unit of the skeletal muscle is called the sarcomere.
  • The sarcomere consists of the thick and thin filament. 
  • The thin filament is made up of the globular protein called actin.
  • The thick filament is made up of the protein called myosin.
  • The light bands contain actin and are called I-band or Isotropic band, whereas the dark band called ‘A’ or Anisotropic band contains myosin.
  • Both the proteins are arranged as rod-like structures, parallel to each other and also to the longitudinal axis of the myofibrils. 
  • In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it.
  • The thin filaments are firmly attached to the ‘Z’ line.
  • The thick filaments in the ‘A’ band are also held together in the middle of this band by a thin fibrous membrane called ‘M’ line. 
  • The ‘A’ and ‘I’ bands are arranged alternately throughout the length of the myofibrils. 
  • The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere. The length of a sarcomere is about 2 -3 micron

Hence, the correct option is 2-3 micron

 

Posted by

seema garhwal

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