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  • The number of mitochondria is few in them, but the amount of sarcoplasmic reticulum is high. Which kind of muscle fibres are these?Option: 1 <

The number of mitochondria is few in them, but the amount of sarcoplasmic reticulum is high. Which kind of muscle fibres are these?

Option: 1

Red muscle fibres


Option: 2

White muscle fibre


Option: 3

Both a and b


Option: 4

None of these


Answers (1)

best_answer

 

 

Red and White Fibres -

  • Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them, causing fatigue. 
  • Muscle contains a red coloured oxygen storing pigment called myoglobin. 
  • Myoglobin content is high in some of the muscles which give a reddish appearance. 
  • Such muscles are called the Red fibres. 
  • These muscles also contain plenty of mitochondria which can utilise a large amount of oxygen stored in them for ATP production.
  • These muscles, therefore, can also be called aerobic muscles. 
  • On the other hand, some of the muscles possess very less quantity of myoglobin and therefore, appear pale or whitish. 
  • These are the White fibres. 
  • The number of mitochondria is also few in them, but the amount of sarcoplasmic reticulum is high. 
  • They depend on the anaerobic process for energy.
  • Red muscle fibres contract slowly but stay contracted for a longer duration
  • White muscle fibres contract rapidly but for a shorter duration 
     

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Some of the muscles possess very less quantity of myoglobin and therefore, appear pale or whitish. These are the White fibres. The number of mitochondria is also few in them, but the amount of sarcoplasmic reticulum is high. Hence, the correct option is white muscle fibres 

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Sayak

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