Skeletal Muscle: Structure and Excitation-Contraction Coupling
- Previous year questions on Skeletal Muscle: Structure and Excitation-Contraction Coupling for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Physiology section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 11 live questions in Skeletal Muscle: Structure and Excitation-Contraction Coupling.
- 1 of 11 questions carries a verified exam year: 2019.
- Physiology is worth about 17 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 19 Aug 2026.
Q1.Each myosin molecule of sarcomere is composed of
- ATwo monomers
- BFour monomers
- CSix monomers✓ Correct answer
- DEight monomers
Q2.Which type of motor unit is of prime importance in generating the muscle power necessary for the maintenance of posture?
- ALow threshold, fatigue-resistant✓ Correct answer
- BHigh threshold, fatigable
- CIntrafusal, gamma controlled
- DHigh threshold, high force
Q3.Which of the following is true regarding the action potential of skeletal muscle?
- AIt spreads inward to all pas of the muscle the T-tubules✓ Correct answer
- BIt has a prolonged plateau phase
- CIt causes the immediate uptake of Ca2+ into the lateral sacs of the sarcoplasmic reticulum
- DIt is longer than the action potential of cardiac muscle
Q4.Skeletal muscles:
- AContracts when calcium is taken up by sacroplasmic reticulum
- BContracts when actin and myosin filaments shorten
- CContraction is initiated by calcium binding to troponin✓ Correct answer
- DContraction is initiated by calcium binding to tropomyosin
Q5.Calcium ions triggers muscle contraction by binding to:
- AActin
- BMyosin
- CTroponin✓ Correct answer
- DTropomyosin
Q6.Myosin head detachment from actin is triggered by:-
- AChange in troponin c configuration
- BEntry of Ca into sarcoplasmic reticulum
- CBinding of ATP to head✓ Correct answer
- DHydrolysis of ATP to ADP and Pi
Q7.Contractile element in myofibril is:
- AH band
- BSarcoplasm
- CSarcomere✓ Correct answer
- DA line
Q8.Considering the latent period of muscle twitch to be 10 ms, contraction time 40 ms and relaxation time 50 ms, what will be the tetanizing frequency for this muscle?
- A25 Hz✓ Correct answer
- B50 Hz
- C100 Hz
- D75 Hz
Q9.Electromyography is used to:
- ATo study muscle activity✓ Correct answer
- BDetermine class II malocclusion
- CDetermine the centric relation
- DDetermine the centric occlusion
Q10.The contractile element in a skeletal muscle is present in:
- ASarcolemma
- BSarcoplasm
- CMyofibril✓ Correct answer
- DEndomysium
Answer key
Q1: C. Six monomers; Q2: A. Low threshold, fatigue-resistant; Q3: A. It spreads inward to all pas of the muscle the T-tubules; Q4: C. Contraction is initiated by calcium binding to troponin; Q5: C. Troponin; Q6: C. Binding of ATP to head; Q7: C. Sarcomere; Q8: A. 25 Hz; Q9: A. To study muscle activity; Q10: C. Myofibril.
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