Muscle Contraction is initiated by

  1. A signal sent by CNS via a motor neuron
  2. A signal sent by PNS via a motor neuron
  3. A signal sent by ANS via efferent neuron
  4. A signal sent by ANS via efferent neuron
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Neuromuscular junction or motor end plate is

  1. The junction between a motor neuron and the sarcolemma of the muscle fibre
  2. The junction between motor neuron and sensory neuron
  3. The junction between sensory neuron and the sarcolemma of the muscle fibre
  4. Both A and C
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A neural signal reaching this junction releases a neurotransmitter…………. Which generates an action potential in the ………..

  1. Acetyl choline, Sarcolemma
  2. Inositol, Sarcolemma
  3. GABA, Sarcoplasmic reticulum
  4. GABA, Sarcoplasm
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The calcium ions released in sarcoplasm will bind to

  1. Tropomyosin
  2. Troponin
  3. Actin
  4. Meromyosin
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The binding of troponin on actin Filaments  actually masks the …..

  1. Active site for Tropomyosin
  2. Active site for ATP
  3. Active site for Myosin
  4. Active site for troponin
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The binding of calcium to troponin actually indicates

  1. Unmasking of Myosin binding site over meromyosin
  2. Unmasking of Myosin binding site over actin
  3. Unmasking of actin binding site over Myosin
  4. Unmasking of actin binding site over tropoiosin
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…………… 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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