…………… projects outwards at regular …….. from each other from the surface of polymerised Myosin Filaments and is also known as …….

  1. Head and short arm, angle, cross arm
  2. Head and short arm, distance, cross arm
  3. Both A and B
  4. Head and short arm, distance, LMM
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Cross bridge is formed in between

  1. Myosin head and active site of actin
  2. Active site of Myosin and head of actin
  3. Both A and B
  4. Between G actin and F actin
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The cross bridge formation actually involves

  1. ATP hydrolysis
  2. Binding of Myosin head to the exposed active sites for myosin
  3. Both A and B
  4. None of these
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During contraction of muscle fibres which of the following does not happen?

  1. The length of A band gets reduced
  2. The attached actin Filaments are pulled towards the centre of A band
  3. The Z line attached to actin Filaments is pulled inward
  4. Shortening of sarcomere
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Which of the following step during sliding Filament Theory is the last step before relaxing state?

  1. ATP utilization
  2. Release of ADP and inorganic phosphate
  3. Cross bridge formation
  4. Binding of calcium with troponin
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Which of the following statements is incorrect?

  1. A new ATP binds and cross bridge is broken with next cycle of contraction
  2. The process of contraction continues till the calcium ions are pumped back to the sarcoplasmic cisternae and resulting in unmasking of actin Filaments
  3. The reaction time of the fibres can vary in different muscles
  4. Both 1 and 3
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Repeated activation of the muscles can lead to

  1. Accumulation of pyruvate due to anaerobic breakdown of glycogen
  2. Accumulation of lactic acid due to anaerobic breakdown of glycogen
  3. Fatigue
  4. Both B and C
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Which of the following property cannot be attributed with white fibres?

  1. Less mitochondria
  2. Anerobic process for energy
  3. Sarcoplasmic reticulum is high
  4. More quantity of myoglobin
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Which of the following property cannot be attributed with red Fibres?

  1. Less myoglobin
  2. More mitochondria
  3. Aerobic process for energy
  4. Both A and C
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Which of the following statements is wrong?
A. Bones and cartilages are specialised connective tissues
B. Skeletal system consists of a framework of more than hundred bones and cartilages
C. Bones have hard matrix due to calcium salt deposition
D. Cartilages have pliable matrix due to chondroitin salts

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