Dark bands (thick filaments) contain myosin and are called:

(a) A-bands or Isotropic band             (b) A-bands or Anisotropic bands

(c) I-bands or Isotropic bands            (d) I-bands or Anisotropic bands

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Choose the letter from the figure that most appropriately corresponds to the structure:

  1. A-band II.     I-band         III.    Sarcomere   IV.     H-zone
  2. Myosin VI.     Actin, Troponin, Tropomyosin    VII.   Z –line

(a) I - E, II - D, III - F, IV - G, V - B, VI- C, VII - A

(b) I - E, II - D, III - C, IV - G, V - B, VI - A, VII - F

(c) I - E, II - D, III - F, IV - G, V - C, VI - A, VII - B

(d) I - E, II - D, III - F, IV - A, V - B, VI - C, VII - G

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The functions of tropomyosin in skeletal muscle include:
(a) Sliding on actin to produce shortening
(b) Release Ca+2 after initiation of contraction
(c) Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
(d) Generates ATP

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Ca+2 bind ________ in the skeletal muscles and leads to exposure of the binding site for ________ on the filament _______:

(a) Troponin, myosin, actin                 (b) Troponin, actin, relaxin

(c) Actin, myosin, troponin                 (d) Tropomysin, myosin, actin

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Following is the figure of actin (thin) filaments. Identify A, B and C:

(a) A - Tropomyosin, B - Troponin, C - F-actin

(b) A - Troponin, B - Myosin, C - Tropomyosin

(c) A - Troponin, B - Tropomyosin, C - Myosin

(d) A - Troponin, B - Tropomyosin, C - F-actin

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The above figure is related with myosin monomer (meromyosin). Identify A to C:

(a) A - head, B - cross arm, C - GTP binding sites

(b) A - head, B - cross arm, C - Ca+2 binding sites

(c) A - head, B - cross arm, C - ATP binding sites

(d) A - cross arm, B - head, C - ATP binding sites

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The action potential that triggers a muscle contraction travels deep within the muscle cell by means of:

(a) Sarcoplasmic reticulum                 (b) Transverse tubules

(c) Synapse                                       (d) Motor end plates

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ATP provides energy for muscle contraction by allowing for:

(a) An action potential formation in the muscle cell

(b) Cross-bridge attachment of myosin to actin

(c) Cross-bridge detachment of myosin from actin

(d) Release of Ca+2 from sarcoplasmic reticulum

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A motor unit is best described as:

(a) All the nerve fibres and muscle fibres in a single muscle bundle

(b) One muscle fibre and its single nerve fibre

(c) A single motor neuron and all the muscle fibres that it innervates

(d) It is the neuron which carries the message from muscle to CNS

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Electrical excitation in a muscle fibre most directly causes:

(a) Movement of tropomyosin

(b) Attachment of the cross bridges to actin

(c) Release of Ca+2 from sarcoplasmic reticulum

(d) Splitting of ATP

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