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Question

Following muscle contraction in response to a stimulus, the muscle temporarily cannot respond. This is known as:

A
Refractory period
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B
Motor end plate
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C
Oxygen debt
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D
Summation period
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Solution

The correct option is B Refractory period
  • 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.
  • Muscle cannot always respond to the stimulus due to fatigue and production of lactic acid this period is called refractory period.
  • So, the correct option is 'refractory period'.

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