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Question

ATP is stored on the myosin cross bridges for immediate energy. After 5 to 6 seconds, this supply is exhausted and the muscle must rely on ________ to quickly produce more ATP.

A
Phosphocreatine
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B
Lactic acid
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C
Acetyl choline
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D
Pyruvic acid
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Solution

The correct option is B Lactic acid
  • Myofibril activity is required for muscle contraction on the molecular level.
  • When ATP binds to myosin, it separates from the actin of the myofibril, which causes a contraction.
  • The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin.
  • ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.
  • When ATP is exhausted lactic acid is produced
So, the correct option is 'lactic acid'.

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