- 1(current)
Q. No.Select the correct statements regarding mechanism of muscle contraction.
Choose the most appropriate answer from the options given below:
1. B, C and E only
2. C, D and E only
3. A and D only
4. B, D and E only
| A. | It is initiated by a signal sent by CNS via sensory neuron. |
| B. | Neurotransmitter generates action potential in the sarcolemma. |
| C. | Increased Ca++ level leads to the binding of calcium with troponin actin filaments. |
| D. | Masking of active site for actin is activated. |
| E. | Utilising the energy from ATP hydrolysis to form cross bridge. |
1. B, C and E only
2. C, D and E only
3. A and D only
4. B, D and E only
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
75%
Level 2: 60%+
NEET - 2024
Hints
According to the sliding filament theory:
| 1. | Actin and myosin filaments slide over each other to increase the length of the sarcomere. |
| 2. | Length of A–band does not change. |
| 3. | I–band increases in length |
| 4. | The actin filaments slide away from A–band resulting in shortening of sarcomere |
Subtopic: Sliding Filament Theory |
75%
Level 2: 60%+
NEET - 2022
Hints
During muscular contraction, which of the following events occur?
| (a) | 'H' zone disappears |
| (b) | 'A' band widens |
| (c) | 'I' band reduces in width |
| (d) | Myosin hydrolyzes ATP, releasing the ADP and Pi |
| (e) | Z-lines attached to actins are pulled inwards |
Choose the correct answer from the options given below:
1. (b), (c), (d) and (e) only
2. (b), (d), (e) and (a) only
3. (a), (c), (d) and (e) only
4. (a), (b), (c) and (d) only
Subtopic: Sliding Filament Theory |
82%
Level 1: 80%+
NEET - 2021
Hints
- 1(current)
Q. No.
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