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Q. No.Identify the incorrect statement:
1.
A skeletal muscle cell is called as a muscle fibre.
2.
A skeletal muscle fibre is a syncytium.
3.
Sarcolemma, the plasma membrane of skeletal muscle cell, encloses the sarcoplasm.
4.
Sarcoplasmic reticulum of the muscle fibres is a rough endoplasmic reticulum and is involved in
excessive protein synthesis.
excessive protein synthesis.
Subtopic: Skeletal Muscle: Basic Anatomy |
79%
From NCERT
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The number of incorrectly matched pairs is/are:
1. 1
2. 2
3. 3
4. 4
| I: | Z line | an attachment point for actin molecules |
| II: | M line | an attachment point for myosin molecules |
| III: | A band | a band where only actin molecules are found |
| IV: | I band | a band where only myosin molecules are found |
1. 1
2. 2
3. 3
4. 4
Subtopic: Skeletal Muscle: Sarcomere |
71%
From NCERT
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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 |
From NCERT
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A skeletal muscle motor unit is best described as:
1. a section of myofibrils from Z lines to Z lines
2. one nerve fiber and all the muscle fibers innervated by that nerve fiber
3. all of the nerves that unite to make a whole muscle contract
4. all of the fascicles innervated by several neurons
1. a section of myofibrils from Z lines to Z lines
2. one nerve fiber and all the muscle fibers innervated by that nerve fiber
3. all of the nerves that unite to make a whole muscle contract
4. all of the fascicles innervated by several neurons
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
66%
From NCERT
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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%
From NCERT
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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%
From NCERT
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During shortening of the muscle, i.e., contraction:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the ‘I’ bands get reduced |
| II: | the ‘A’ bands retain the length |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Skeletal Muscle: Sarcomere | Muscle Contraction: Other Considerations |
90%
From NCERT
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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 |
90%
From NCERT
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Which of the following is not included in human axial skeleton?
1. The skull
2. The vertebral column
3. The sternum
4. The clavicle
1. The skull
2. The vertebral column
3. The sternum
4. The clavicle
Subtopic: Appendicular Skeleton |
91%
From NCERT
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