When more energy is required in muscle contraction then that energy can also be produced by _ as a secondary source.
Correct answer: B. Phosphocreatine
- A. Glucose
- B. Phosphocreatine
- C. Fructose
- D. Lactic acid
Explanation
After glucose, Phosphocreatine serves as a secondary source of energy.
This question appeared on the UHS MDCAT 2014 paper, which you can sit online with every answer explained.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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More Muscle Contraction questions
When calcium ions are released from the sarcoplasmic reticulum, they bind with _ during muscle contraction.
Choose the correct, for muscle in relaxed position:
Which of these processes helps in skeletal muscle relaxation after contraction?
Which of the following occurs during muscular contraction?
The function of tropomyosin is to prevent actin and myosin from - when the muscle is at rest.
If muscle contracts upon stimulation, calcium ions bind to _, which exposes the binding sites for the myosin cross-bridges to attach to.