- 1(current)
Q. No.Which of the following masks the active sites on actin when a skeletal muscle is relaxed?
| 1. | Tropomyosin | 2. | Troponin |
| 3. | Calmodulin | 4. | Ubiquitin |
Subtopic: Sliding Filament Theory | Energy for Muscle Contraction |
84%
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Subtopic: Energy for Muscle Contraction |
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During muscle contraction, when the myosin head releases ADP and iP it:
1. forms cross bridge with actin
2. pulls actin towards M-line
3. goes back to its relaxed state
4. gets detached from the cross bridge
Subtopic: Sliding Filament Theory | Energy for Muscle Contraction |
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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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During relaxation of a skeletal muscle:
| 1. | Calcium ions that are bound to troponin C now bind to troponin A |
| 2. | Cross bridge formation between myosin head and actin takes place |
| 3. | The A band of the sarcomere lengthens |
| 4. | Calcium ions are pumped back to the sarcoplasmic cisternae |
Subtopic: Sliding Filament Theory | Energy for Muscle Contraction |
86%
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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%
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%
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- 1(current)
Q. No.
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