OSMT (Ontario Society of Medical Technologists) Practice Exam

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The most abundant source of energy in a muscle fibre is:

  1. a. glycogen

  2. b. ATP

  3. c. Fat

  4. d. creatine phosphate

The correct answer is: d. creatine phosphate

In a muscle fibre, creatine phosphate is the most abundant source of energy. Creatine phosphate plays a critical role in rapidly regenerating ATP, which is the primary energy source for muscle contractions during short, intense bursts of activity. While glycogen and fats are also essential sources of energy in muscles, creatine phosphate is specifically highlighted for its immediate contribution to ATP production in activities like weightlifting or sprinting.

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