Quiz  /  NEET MCQ on Sliding Filament Theory

  • 1. 
    Which of the following ions is responsible for unmasking of active binding sites on actin for forming cross-bridge during muscle contraction?

  • Potassium
  • Magnesium
  • Sodium
  • Calcium

  • 2. 
    Sliding theory states that

  • actin and myosin filaments shorten and slide past each other
  • when myofilaments slide past each other, shortening of actin filaments occur
  • when myofilaments slide past each other, shortening of myosin filaments occur
  • actin and myosin filaments do not shorten, they only slide past each other

  • 3. 
    Which of the following is correct for muscle contraction?

  • Shortening of actin filaments
  • Shortening of A, H and I bands
  • No change in A bands
  • Sarcomere do not shorten

  • 4. 
    Which of the following shows ATPase activity during muscle contraction?

  • Actin
  • Tropomyosin
  • Troponin
  • Myosin

  • 5. 
    Which of the following is correct for muscle contraction?

  • Distance between two Z line increases
  • Length of I band increases
  • Length of A band remains constant
  • Length of H zone increases

  • 6. 
    Sarcomere is

  • the part between two Z-lines
  • the part between two I-bands
  • the part between two A-lines
  • the part between two H-lines

  • 7. 
    This is a contractile protein of muscles

  • Myosin
  • Tubulin
  • Tropomyosin
  • All of the above

  • 8. 
    Which of the following is a functional unit of striated muscles?

  • Myofibril
  • Cross-bridges
  • Z-band
  • Sarcomere

  • 9. 
    When actin filaments are dragged towards M-line, it is known as

  • recovery stroke
  • refractory stroke
  • power stroke
  • none of the above

  • 10. 
    Accumulation of __________ causes muscle fatigue

  • lactic acid
  • myosin ATPase
  • carbon dioxide
  • none of the above
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