NEET Test Series from KOTA - 10 Papers In MS WORD
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BIOXI20: LOCOMOTION AND MOVEMENT
340012
Which of the following options shows correct order of some stages of muscle contraction from the beginning to the end of the process?
1 Stimuli, Neurotransmitter secretion, cross bridges formation, Excitation of T-system, Sliding of actin filaments.
2 Stimuli, Excitation of T-system, Neurotransmitter secretion, cross bridges formation, Sliding of actin filaments, 'H'- band diminishes
3 Stimuli, neurotransmitter secretion, Release of \(\mathrm{Ca}^{2+}\), cross bridges formation, Excitation of T-system Sliding of actin filaments.
4 Stimuli, Neurotransmitter secretion, Excitation of T-system release of \(\mathrm{Ca}^{+2}\) cross, bridges formation, Sliding of actin filaments, ' \(\mathrm{H}\) ' - band diminishes
Explanation:
The contraction of skeletal muscle includes biochemical and ultrastructural events. Ultrastructural events leads with stimuli excitation of T-system followed by cross bridge formation and the cross bridge breakage. Biochemical events explain that stimuli leads to neurotransmitter secretion, excitation of T-system and release of \(\mathrm{Ca}^{2+}\).
BIOXI20: LOCOMOTION AND MOVEMENT
340013
What is the location of troponin in the process of muscle contraction?
1 Attached to calcium
2 Attached to tropomyosin
3 Attached to myosin cross bridge
4 Both 1 and 2
Explanation:
In the event of muscle contraction, the \(\mathrm{Ca}^{2+}\) binding causes a conformational change in the troponin which results in pulling the tropomyosin away exposing the active sites on the actin filaments to which the myosin heads bind to initiate muscle contraction.
BIOXI20: LOCOMOTION AND MOVEMENT
340014
The function of tropomyosin in skeletal muscles is
1 Sliding on actin filaments to shorten the muscle fibres
2 Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
3 Releasing \(\mathrm{Ca}^{+2}\) after initiation of contraction
4 Acting as ATPase essential for muscle contraction and relaxation
Explanation:
Tropomyosin is an \(\alpha\)-helical rod having double strands and it is a fibrous molecule that will attach to F-actin. Tropomyosin masks the myosin binding sites of F-actin, keeping the muscle fibre relaxed. At a resting state, tropomyosin molecule will lie at the top of actin strands, such that contraction of the muscle does not take place.
BIOXI20: LOCOMOTION AND MOVEMENT
340015
Which of the following statement is correct regarding sliding filament theory?
1 Contraction of muscle fibre takes place by the sliding of thick filament over thin filament
2 Contraction of muscle fibre takes place by the sliding of thin filament over thick filament
3 Contraction of muscle fibre takes place by the sliding of thick and thin filament on each other
4 None of above
Explanation:
H. E. Huxley, A. F. Huxley and Ralph gave the sliding filament theory of muscle contraction which states that the thin myofilaments slide over the thick filament and penetrate deeper into \(\mathrm{A}\) bands in the contracting muscle fibre.
340012
Which of the following options shows correct order of some stages of muscle contraction from the beginning to the end of the process?
1 Stimuli, Neurotransmitter secretion, cross bridges formation, Excitation of T-system, Sliding of actin filaments.
2 Stimuli, Excitation of T-system, Neurotransmitter secretion, cross bridges formation, Sliding of actin filaments, 'H'- band diminishes
3 Stimuli, neurotransmitter secretion, Release of \(\mathrm{Ca}^{2+}\), cross bridges formation, Excitation of T-system Sliding of actin filaments.
4 Stimuli, Neurotransmitter secretion, Excitation of T-system release of \(\mathrm{Ca}^{+2}\) cross, bridges formation, Sliding of actin filaments, ' \(\mathrm{H}\) ' - band diminishes
Explanation:
The contraction of skeletal muscle includes biochemical and ultrastructural events. Ultrastructural events leads with stimuli excitation of T-system followed by cross bridge formation and the cross bridge breakage. Biochemical events explain that stimuli leads to neurotransmitter secretion, excitation of T-system and release of \(\mathrm{Ca}^{2+}\).
BIOXI20: LOCOMOTION AND MOVEMENT
340013
What is the location of troponin in the process of muscle contraction?
1 Attached to calcium
2 Attached to tropomyosin
3 Attached to myosin cross bridge
4 Both 1 and 2
Explanation:
In the event of muscle contraction, the \(\mathrm{Ca}^{2+}\) binding causes a conformational change in the troponin which results in pulling the tropomyosin away exposing the active sites on the actin filaments to which the myosin heads bind to initiate muscle contraction.
BIOXI20: LOCOMOTION AND MOVEMENT
340014
The function of tropomyosin in skeletal muscles is
1 Sliding on actin filaments to shorten the muscle fibres
2 Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
3 Releasing \(\mathrm{Ca}^{+2}\) after initiation of contraction
4 Acting as ATPase essential for muscle contraction and relaxation
Explanation:
Tropomyosin is an \(\alpha\)-helical rod having double strands and it is a fibrous molecule that will attach to F-actin. Tropomyosin masks the myosin binding sites of F-actin, keeping the muscle fibre relaxed. At a resting state, tropomyosin molecule will lie at the top of actin strands, such that contraction of the muscle does not take place.
BIOXI20: LOCOMOTION AND MOVEMENT
340015
Which of the following statement is correct regarding sliding filament theory?
1 Contraction of muscle fibre takes place by the sliding of thick filament over thin filament
2 Contraction of muscle fibre takes place by the sliding of thin filament over thick filament
3 Contraction of muscle fibre takes place by the sliding of thick and thin filament on each other
4 None of above
Explanation:
H. E. Huxley, A. F. Huxley and Ralph gave the sliding filament theory of muscle contraction which states that the thin myofilaments slide over the thick filament and penetrate deeper into \(\mathrm{A}\) bands in the contracting muscle fibre.
340012
Which of the following options shows correct order of some stages of muscle contraction from the beginning to the end of the process?
1 Stimuli, Neurotransmitter secretion, cross bridges formation, Excitation of T-system, Sliding of actin filaments.
2 Stimuli, Excitation of T-system, Neurotransmitter secretion, cross bridges formation, Sliding of actin filaments, 'H'- band diminishes
3 Stimuli, neurotransmitter secretion, Release of \(\mathrm{Ca}^{2+}\), cross bridges formation, Excitation of T-system Sliding of actin filaments.
4 Stimuli, Neurotransmitter secretion, Excitation of T-system release of \(\mathrm{Ca}^{+2}\) cross, bridges formation, Sliding of actin filaments, ' \(\mathrm{H}\) ' - band diminishes
Explanation:
The contraction of skeletal muscle includes biochemical and ultrastructural events. Ultrastructural events leads with stimuli excitation of T-system followed by cross bridge formation and the cross bridge breakage. Biochemical events explain that stimuli leads to neurotransmitter secretion, excitation of T-system and release of \(\mathrm{Ca}^{2+}\).
BIOXI20: LOCOMOTION AND MOVEMENT
340013
What is the location of troponin in the process of muscle contraction?
1 Attached to calcium
2 Attached to tropomyosin
3 Attached to myosin cross bridge
4 Both 1 and 2
Explanation:
In the event of muscle contraction, the \(\mathrm{Ca}^{2+}\) binding causes a conformational change in the troponin which results in pulling the tropomyosin away exposing the active sites on the actin filaments to which the myosin heads bind to initiate muscle contraction.
BIOXI20: LOCOMOTION AND MOVEMENT
340014
The function of tropomyosin in skeletal muscles is
1 Sliding on actin filaments to shorten the muscle fibres
2 Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
3 Releasing \(\mathrm{Ca}^{+2}\) after initiation of contraction
4 Acting as ATPase essential for muscle contraction and relaxation
Explanation:
Tropomyosin is an \(\alpha\)-helical rod having double strands and it is a fibrous molecule that will attach to F-actin. Tropomyosin masks the myosin binding sites of F-actin, keeping the muscle fibre relaxed. At a resting state, tropomyosin molecule will lie at the top of actin strands, such that contraction of the muscle does not take place.
BIOXI20: LOCOMOTION AND MOVEMENT
340015
Which of the following statement is correct regarding sliding filament theory?
1 Contraction of muscle fibre takes place by the sliding of thick filament over thin filament
2 Contraction of muscle fibre takes place by the sliding of thin filament over thick filament
3 Contraction of muscle fibre takes place by the sliding of thick and thin filament on each other
4 None of above
Explanation:
H. E. Huxley, A. F. Huxley and Ralph gave the sliding filament theory of muscle contraction which states that the thin myofilaments slide over the thick filament and penetrate deeper into \(\mathrm{A}\) bands in the contracting muscle fibre.
340012
Which of the following options shows correct order of some stages of muscle contraction from the beginning to the end of the process?
1 Stimuli, Neurotransmitter secretion, cross bridges formation, Excitation of T-system, Sliding of actin filaments.
2 Stimuli, Excitation of T-system, Neurotransmitter secretion, cross bridges formation, Sliding of actin filaments, 'H'- band diminishes
3 Stimuli, neurotransmitter secretion, Release of \(\mathrm{Ca}^{2+}\), cross bridges formation, Excitation of T-system Sliding of actin filaments.
4 Stimuli, Neurotransmitter secretion, Excitation of T-system release of \(\mathrm{Ca}^{+2}\) cross, bridges formation, Sliding of actin filaments, ' \(\mathrm{H}\) ' - band diminishes
Explanation:
The contraction of skeletal muscle includes biochemical and ultrastructural events. Ultrastructural events leads with stimuli excitation of T-system followed by cross bridge formation and the cross bridge breakage. Biochemical events explain that stimuli leads to neurotransmitter secretion, excitation of T-system and release of \(\mathrm{Ca}^{2+}\).
BIOXI20: LOCOMOTION AND MOVEMENT
340013
What is the location of troponin in the process of muscle contraction?
1 Attached to calcium
2 Attached to tropomyosin
3 Attached to myosin cross bridge
4 Both 1 and 2
Explanation:
In the event of muscle contraction, the \(\mathrm{Ca}^{2+}\) binding causes a conformational change in the troponin which results in pulling the tropomyosin away exposing the active sites on the actin filaments to which the myosin heads bind to initiate muscle contraction.
BIOXI20: LOCOMOTION AND MOVEMENT
340014
The function of tropomyosin in skeletal muscles is
1 Sliding on actin filaments to shorten the muscle fibres
2 Acting as "relaxing protein" at rest by covering up the sites where myosin binds to actin
3 Releasing \(\mathrm{Ca}^{+2}\) after initiation of contraction
4 Acting as ATPase essential for muscle contraction and relaxation
Explanation:
Tropomyosin is an \(\alpha\)-helical rod having double strands and it is a fibrous molecule that will attach to F-actin. Tropomyosin masks the myosin binding sites of F-actin, keeping the muscle fibre relaxed. At a resting state, tropomyosin molecule will lie at the top of actin strands, such that contraction of the muscle does not take place.
BIOXI20: LOCOMOTION AND MOVEMENT
340015
Which of the following statement is correct regarding sliding filament theory?
1 Contraction of muscle fibre takes place by the sliding of thick filament over thin filament
2 Contraction of muscle fibre takes place by the sliding of thin filament over thick filament
3 Contraction of muscle fibre takes place by the sliding of thick and thin filament on each other
4 None of above
Explanation:
H. E. Huxley, A. F. Huxley and Ralph gave the sliding filament theory of muscle contraction which states that the thin myofilaments slide over the thick filament and penetrate deeper into \(\mathrm{A}\) bands in the contracting muscle fibre.
