Muscle Fibre Types - Quick Questions

• Complete this sentence: Postural muscles contain mostly ____ twitch fibres and are ___ in colour
  
  
  
• Type 2a fibres are red in colour due to the high content of what?
  
  
  
• Type 2b fibres are often called what?
  
  
  
• Can training cause changes in muscle fibre type? If so, which?
  
  
  
• Marathon runners would have more of which type of muscle fibre?
  
  

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