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Q. No.Ciliary movements in the human body help in:
I:
removing dust particles and some of the foreign substances inhaled along with the atmospheric air.
II:
passage of urine in the collecting duct of the nephron.
III:
passage of ova through the female reproductive tract
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Introduction to Locomotion |
83%
From NCERT
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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. |
Subtopic: Skeletal Muscle: Basic Anatomy |
79%
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: | 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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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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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%
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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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%
From NCERT
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