- 1(current)
Q. No.During muscular contraction, which of the following events do not occur?
Choose the correct answer from the options given below.
1. (a), (b), (c) and (d)
2. (a), (b), (d) and (e)
3. (a), (c) and (e)
4. (b) and (d)
| a. | ‘H’ zone decreases in length and disappears on full relaxation |
| b. | A band remains unchanged |
| c. | I band gets reduced in length due to decrease in length of actin filaments |
| d. | Myosin hydrolyses ATP, releasing ADP and P1 |
| e. | Z- lines move away from each other |
1. (a), (b), (c) and (d)
2. (a), (b), (d) and (e)
3. (a), (c) and (e)
4. (b) and (d)
Subtopic: Sliding Filament Theory |
66%
Level 2: 60%+
Hints
Consider the following statements with respect to mechanism of muscle contraction
Select the option with the correct statement
1. a and c only
2. b and d only
3. a, c and d
4. b, c and d
| (a) | Binding of calcium with the subunit of tropomyosin removes the masking of active sites for myosin |
| (b) | Z-lines move towards the centre of ‘H’ zone |
| (c) | Cross bridge is formed by utilising the energy from hydrolysis of ATP |
| (d) | H-zone disappears when a muscle fibre is maximally contracted |
Select the option with the correct statement
1. a and c only
2. b and d only
3. a, c and d
4. b, c and d
Subtopic: Sliding Filament Theory |
67%
Level 2: 60%+
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
| Assertion (A): | The mechanism of muscle contraction can be explained by sliding-filament theory. |
| Reason (R): | Muscular contraction occurs by the sliding of thick filaments over the thin filaments. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Sliding Filament Theory |
83%
Level 1: 80%+
Hints
Assertion (A): Sliding filament theory can be best explained as actin and filaments do not shorten but rather slide pass each other.
Reason (R): Sliding filament theory was introduced b Andrew Huxley, Rolf Niedergerke, Hugh Huxley and Jean Hanson.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false
Reason (R): Sliding filament theory was introduced b Andrew Huxley, Rolf Niedergerke, Hugh Huxley and Jean Hanson.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false
Subtopic: Sliding Filament Theory |
76%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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