CanFitPro Personal Training Specialist Practice Test

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What is true about fast twitch muscle fibers?

  1. They are primarily used for endurance activities

  2. They produce force slowly and are prone to fatigue

  3. They have a high amount of mitochondria

  4. They contract quickly and produce a great deal of force but fatigue quickly

The correct answer is: They contract quickly and produce a great deal of force but fatigue quickly

Fast twitch muscle fibers are characterized by their ability to contract quickly and produce a great deal of force. Unlike slow twitch muscle fibers, which are used for endurance activities, fast twitch muscle fibers are better suited for short bursts of intense activity. They fatigue quickly due to their rapid energy metabolism and do not have a high amount of mitochondria, which are responsible for energy production in the cell. Option B is incorrect because fast twitch muscle fibers do not produce force slowly. Option A is incorrect because fast twitch muscle fibers are not primarily used for endurance activities. Option C is incorrect because fast twitch muscle fibers do not have a high amount of mitochondria.

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