Which of the following is a muscle component that acts as a store for energy?
Correct answer: B. Creatine-PO4
- A. ATP
- B. Creatine-PO4
- C. Myoglobin
- D. Creatinine-P04
Explanation
Creatine-PO4, also known as phosphocreatine, is a muscle component that acts as a store for energy. During intense physical activity or muscle contraction, the breakdown of adenosine triphosphate (ATP) provides immediate energy. However, the availability of ATP is limited. Creatine-PO4 helps replenish ATP levels by donating its high-energy phosphate group to ADP, forming ATP. This process allows for a rapid regeneration of ATP, providing a quick source of energy for muscle contraction.
This question appeared on the UHS MDCAT 2022 paper, which you can sit online with every answer explained.
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Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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