The functions of tropomyosin in skeletal muscle include:
(1) Sliding on actin to produce shortening
(2) Release Ca+2 after initiation of contraction
(3) Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
(4) Generates ATP
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCa+2 bind ________ in the skeletal muscles and leads to exposure of the binding site for ________ on the filament _______:
(1) Troponin, myosin, actin
(2) Troponin, actin, relaxin
(3) Actin, myosin, troponin
(4) Tropomysin, myosin, actin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFollowing is the figure of actin (thin) filaments. Identify A, B and C:
(1) A - Tropomyosin, B - Troponin, C - F-actin
(2) A - Troponin, B - Myosin, C - Tropomyosin
(3) A - Troponin, B - Tropomyosin, C - Myosin
(4) A - Troponin, B - Tropomyosin, C - F-actin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe above figure is related with myosin monomer (meromyosin). Identify A to C:
(1) A - head, B - cross arm, C - GTP binding sites
(2) A - head, B - cross arm, C - Ca+2 binding sites
(3) A - head, B - cross arm, C - ATP binding sites
(4) A - cross arm, B - head, C - ATP binding sites
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe action potential that triggers a muscle contraction travels deep within the muscle cell by means of:
(1) Sarcoplasmic reticulum
(2) Transverse tubules
(3) Synapse
(4) Motor end plates
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyATP provides energy for muscle contraction by allowing for:
(1) An action potential formation in the muscle cell
(2) Cross-bridge attachment of myosin to actin
(3) Cross-bridge detachment of myosin from actin
(4) Release of Ca+2 from sarcoplasmic reticulum
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA motor unit is best described as:
(1) All the nerve fibres and muscle fibres in a single muscle bundle
(2) One muscle fibre and its single nerve fibre
(3) A single motor neuron and all the muscle fibres that it innervates
(4) It is the neuron which carries the message from muscle to CNS
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyElectrical excitation in a muscle fibre most directly causes:
(1) Movement of tropomyosin
(2) Attachment of the cross bridges to actin
(3) Release of Ca+2 from sarcoplasmic reticulum
(4) Splitting of ATP
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe energy for muscle contraction is most directly obtained from:
(1) Phosphocreatine
(2) ATP
(3) Anaerobic respiration
(4) Aerobic respiration
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPut the following phrases in proper order to describe what occurs at the neuromuscular junction to trigger muscle contraction:
I. Receptor sites on sarcolemma.
II. Nerve impulse.
III. Release of Ca+2 from sarcoplasmic reticulum
IV. The neurotransmitter acetylcholine is released
V. Sarcomere shortern
VI. Synaptic cleft
VII. Spread of impulses over sarcolemma on T-tubules
(1) II, IV, I, VI, VII, III, V
(2) II, IV, VI, I, VII, III, V
(3) I, II, III, IV, V, VI, VII
(4) VII, VI, V, IV, III, II, I
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology