Question

Which of the following correctly characterises a "fast-oxidative" type of skeletal muscle fibre?

• A. Few mitochondria and high glycogen content
• B. Low myosin ATPase rate and few surrounding capillaries
• C. Low glycolytic enzyme activity and intermediate contraction velocity
• D. High myoglobin content and intermediate glycolytic enzyme activity

Answer 1

The correct option is A Few mitochondria and high glycogen content

Fast oxidative type of muscle fibres is generally found in the sprinters that need to run for a short amount of time. They do not need to have a very large number of mitochondria for continuous ATP production but they do need to have speed. So in such muscle fibres, there is a high glycogen content which is converting into lactic acid rapidly and fatigue is caused more early.

So, the correct option is 'Few mitochondria and high glycogen content'