Q. No.The dark and light bands seen as striations in a skeletal muscle are located on:
| 1. | Myofilaments | 2. | Muscle fiber |
| 3. | Myofibril | 4. | Motor unit |
Subtopic: Skeletal Muscle: Sarcomere |
55%
From NCERT
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The correct statement regarding myofibril would be:
| 1. | It is the name for a muscle cell. |
| 2. | It contains sarcoplasmic reticulum. |
| 3. | It is made up of many sarcomeres. |
| 4. | It is a bundle of muscle cells. |
Subtopic: Skeletal Muscle: Sarcomere |
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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: | Thick filaments within the myofibril are composed primarily of actin. |
| Statement II: | Thin filaments within the myofibril are composed primarily of myosin. |
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: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
92%
From NCERT
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The number of correct statements from the statements given below will be:
| I: | The striated appearance of skeletal muscle myofibril is due to the distribution pattern of two important proteins – Actin and Myosin. |
| II: | The light band contains actin and is called as I-band or Isotropic band. |
| III: | Actin and myosin in a myofibril are arranged as rod-like structures, parallel to each other and also to the longitudinal axis of the myofibrils. |
| IV: | Actin filaments are thinner as compared to the myosin filaments. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Skeletal Muscle: Basic Anatomy | Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
84%
From NCERT
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The central part of the thick filaments not overlapped by the thin filaments is called as:
| 1. | A band | 2. | I band |
| 3. | H zone | 4. | Sarcomere |
Subtopic: Skeletal Muscle: Sarcomere |
88%
From NCERT
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Subtopic: Skeletal Muscle: Sarcomere |
82%
From NCERT
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The part of the sarcomere that is composed of only myosin myofilaments is:
| 1. | A band | 2. | I band |
| 3. | M line | 4. | H zone |
Subtopic: Skeletal Muscle: Sarcomere |
60%
From NCERT
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Identify the incorrect statement regarding a sarcomere:
| 1. | Anisotropic band mainly contains myosin. |
| 2. | Isotropic band consists of actin. |
| 3. | The thick filaments are held together by an M-line. |
| 4. | Actin and myosin are arranged perpendicular to each other and also to the longitudinal axis of myofibrils. |
Subtopic: Skeletal Muscle: Sarcomere |
86%
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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Regarding the ultra-structure of a sarcomere, the Z line corresponds to:
| 1. | a band where only actin molecules are found |
| 2. | a band where only myosin molecules are found |
| 3. | an attachment point for actin molecules |
| 4. | an attachment point for myosin molecules |
Subtopic: Skeletal Muscle: Myofilaments | Skeletal Muscle: Sarcomere |
78%
From NCERT
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