- 1(current)
Q. No.Which of the following statements are correct regarding skeletal muscle?
Choose the most appropriate answer from the options given below:
| A: | Muscle bundles are held together by collagenous connective tissue layer called fascicle. |
| B: | Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions. |
| C: | Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins. |
| D: | M line is considered as functional unit of contraction called sarcomere. |
| 1. | C and D only | 2. | A, B and C only |
| 3. | B and C only | 4. | A, C and D only |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
55%
Level 3: 35%-60%
NEET - 2023
Hints
The H-zone in the skeletal muscle fibre is due to:
| 1. | The central gap between myosin filaments in the A-band. |
| 2. | The central gap between actin filaments extends through myosin filaments in the A-band. |
| 3. | Extension of myosin filaments in the central portion of the A-band |
| 4. | The absence of myofibrils in the central portion of the A-band. |
Subtopic: Skeletal Muscle: Sarcomere |
59%
Level 3: 35%-60%
AIPMT - 2013
Hints
The sarcoplasmic reticulum in a skeletal muscle fiber is a type of
| 1. | smooth endoplasmic reticulum and stores acetylcholine |
| 2. | rough endoplasmic reticulum and stores acetylcholine |
| 3. | smooth endoplasmic reticulum and stores calcium |
| 4. | rough endoplasmic reticulum and stores calcium |
Subtopic: Skeletal Muscle: Sarcomere |
75%
Level 2: 60%+
Please attempt this question first.
Hints
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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%
Level 1: 80%+
Please attempt this question first.
Hints
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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 |
73%
Level 2: 60%+
Please attempt this question first.
Hints
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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 |
88%
Level 1: 80%+
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Please attempt this question first.
- 1(current)
Q. No.
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