Q. No.Consider the given two statements:
Statement I: The junction between a motor neuron and the sarcolemma of a muscle fibre is called the motor unit.
Statement II: Sarcolemma is the plasma membrane of a muscle fibre enclosing the sarcoplasm.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Statement I: The junction between a motor neuron and the sarcolemma of a muscle fibre is called the motor unit.
Statement II: Sarcolemma is the plasma membrane of a muscle fibre enclosing the sarcoplasm.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Subtopic: Muscle | Mechanism of muscle contraction |
Level 3: 35%-60%
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Consider the given two statements:
Statement I: The sliding filament theory explains that contraction results from the sliding of thin filaments over thick ones.
Statement II: During contraction, the lengths of both A and I bands decrease.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Statement I: The sliding filament theory explains that contraction results from the sliding of thin filaments over thick ones.
Statement II: During contraction, the lengths of both A and I bands decrease.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Subtopic: Mechanism of muscle contraction |
88%
Level 1: 80%+
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Consider the given two statements:
Statement I: Binding of ATP to myosin head causes detachment of myosin from actin filament.
Statement II: Hydrolysis of ATP to ADP and Pi re-energises the myosin head for the next stroke
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Statement I: Binding of ATP to myosin head causes detachment of myosin from actin filament.
Statement II: Hydrolysis of ATP to ADP and Pi re-energises the myosin head for the next stroke
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Subtopic: Mechanism of muscle contraction |
83%
Level 1: 80%+
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Consider the given two statements:
Statement I: The sarcoplasmic reticulum releases Ca²⁺ ions at the onset of contraction.
Statement II: These Ca²⁺ ions bind to tropomyosin causing cross-bridge formation.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Statement I: The sarcoplasmic reticulum releases Ca²⁺ ions at the onset of contraction.
Statement II: These Ca²⁺ ions bind to tropomyosin causing cross-bridge formation.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Subtopic: Mechanism of muscle contraction |
63%
Level 2: 60%+
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Consider the given two statements:
Statement I: Red muscle fibres have a lower myoglobin content than white muscle fibres.
Statement II: Which muscle fibres have a lower sarcoplasmic reticulum content than red muscle fibres.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Statement I: Red muscle fibres have a lower myoglobin content than white muscle fibres.
Statement II: Which muscle fibres have a lower sarcoplasmic reticulum content than red muscle fibres.
1. Both I and II are correct
2. Both I and II are incorrect
3. I correct, II incorrect
4. I incorrect, II correct
Subtopic: Mechanism of muscle contraction |
77%
Level 2: 60%+
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The neurotransmitter involved at the neuromuscular junction is:
1. Dopamine
2. Acetylcholine
3. Serotonin
4. Noradrenaline
1. Dopamine
2. Acetylcholine
3. Serotonin
4. Noradrenaline
Subtopic: Mechanism of muscle contraction |
97%
Level 1: 80%+
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During muscle contraction, which of the following events occurs FIRST after the action potential reaches the neuromuscular junction?
1. Binding of myosin heads to actin filaments
2. Release of calcium ions from sarcoplasmic reticulum
3. Release of acetylcholine from synaptic vesicles
4. Hydrolysis of ATP to provide energy for contraction
1. Binding of myosin heads to actin filaments
2. Release of calcium ions from sarcoplasmic reticulum
3. Release of acetylcholine from synaptic vesicles
4. Hydrolysis of ATP to provide energy for contraction
Subtopic: Mechanism of muscle contraction |
Level 3: 35%-60%
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In a sarcomere during muscle contraction:
1. Both A band and I band decrease in length
2. A band remains constant while I band and H zone decrease
3. A band increases while I band decreases
4. H zone increases while I band remains constant
1. Both A band and I band decrease in length
2. A band remains constant while I band and H zone decrease
3. A band increases while I band decreases
4. H zone increases while I band remains constant
Subtopic: Mechanism of muscle contraction |
91%
Level 1: 80%+
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During muscle contraction, the role of Ca²⁺ ions is best described as:
1. Direct binding to myosin head enabling ATP hydrolysis.
2. Removal of troponin from actin filaments permanently.
3. Exposure of myosin-binding sites on actin by shifting tropomyosin.
4. Conversion of ATP into ADP and inorganic phosphate
1. Direct binding to myosin head enabling ATP hydrolysis.
2. Removal of troponin from actin filaments permanently.
3. Exposure of myosin-binding sites on actin by shifting tropomyosin.
4. Conversion of ATP into ADP and inorganic phosphate
Subtopic: Mechanism of muscle contraction |
68%
Level 2: 60%+
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The neurotransmitter released at neuromuscular junction is:
| 1. | Norepinephrine for muscle contraction |
| 2. | Dopamine for impulse transmission |
| 3. | Acetylcholine causing depolarisation |
| 4. | Serotonin regulating muscle tone |
Subtopic: Mechanism of muscle contraction |
95%
Level 1: 80%+
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