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Q. No.Consider the given two statements:
Statement I:
The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.
Statement II:
In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments.
Statement III:
The central part of thick filament, not overlapped by thin filaments is called the ‘H’ zone.
1.
Statement I is correct; Statement II is correct; Statement III is correct
2.
Statement I is correct; Statement II is incorrect; Statement III is correct
3.
Statement I is incorrect; Statement II is correct; Statement III is incorrect
4.
Statement I is incorrect; Statement II is incorrect; Statement III is incorrect
Subtopic: Skeletal Muscle: Sarcomere |
87%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | A single filament of tropomyosin runs close to the ‘F’ actins throughout its length. |
| Statement II: | In the resting state, a subunit of troponin masks the active binding sites for myosin on the actin filaments. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Skeletal Muscle: Myofilaments |
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Contraction of a skeletal muscle fibre takes place by:
| 1. | shortening of both actin and myosin myofilaments |
| 2. | shortening of actin and lengthening of myosin myofilaments |
| 3. | the sliding of the thin filaments over the thick filaments |
| 4. | the sliding of the thick filaments over the thin filaments |
Subtopic: Sliding Filament Theory |
92%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | The junction between a motor neuron and the sarcolemma of the muscle fibre is called the neuromuscular junction. |
| Statement II: | A neural signal reaching the neuromuscular junction releases a neurotransmitter, Acetyl choline, which generates an action potential in the sarcolemma. |
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Skeletal Muscle: Sarcomere | Excitation Contraction Coupling II | Sliding Filament Theory |
94%
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Calcium released into the sarcoplasm during muscle contraction:
| 1. | binds to the actin and myosin and makes them work together. |
| 2. | breaks apart ATP to ADP and P. |
| 3. | removes the tropomyosin block. |
| 4. | causes the release of acetylcholine. |
Subtopic: Sliding Filament Theory |
62%
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The immediate source of chemical energy that can be used by skeletal muscle tissue to allow muscle contraction is:
| 1. | glucose | 2. | glycogen |
| 3. | ATP | 4. | creatine phosphate |
Subtopic: Sliding Filament Theory | Energy for Muscle Contraction |
84%
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To form a cross bridge, during muscle contraction:
| 1. | the myosin head binds to the exposed active sites on actin utilising the energy from ATP hydrolysis |
| 2. | the myosin head binds to the exposed active sites on actin and then the ATP binds to its site on myosin head |
| 3. | the actin binds to the exposed active sites on myosin head utilising the energy from ATP hydrolysis |
| 4. | the actin binds to the exposed active sites on myosin head and then the ATP binds to its site on actin |
Subtopic: Sliding Filament Theory |
73%
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Consider the given two statements regarding the cycle of events taking place during skeletal muscle contraction:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | The myosin, hydrolysing ATP into ADP and Pi goes back to its relaxed state. |
| Statement II: | Cross bridge is broken when myosin releases ADP and Pi. |
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Sliding Filament Theory | Energy for Muscle Contraction |
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The process of skeletal muscle contraction continues till:
| 1. | Myosin goes back to its relaxed state. |
| 2. | A cross bridge is formed. |
| 3. | Ca2+ ions are pumped back to the sarcoplasmic cisternae. |
| 4. | Lactic acid accumulates in the muscle |
Subtopic: Excitation Contraction Coupling I | Excitation Contraction Coupling II | Sliding Filament Theory |
88%
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Consider the given two statements:
| Statement I: | Repeated activation of the muscles can lead to fatigue. |
| Statement II: | Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Energy for Muscle Contraction | Muscle Contraction: Other Considerations |
89%
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