- 1(current)
Q. No.The structure of myosin and actin in muscle contraction involves:
1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A, B and C are correct
| A: | Myosin having cross-bridges that attach to actin filaments. |
| B: | Actin filaments sliding over myosin to shorten the muscle. |
| C: | Myosin acting as a thin filament and actin as a thick filament. |
1. A and B are correct
2. B and C are correct
3. A and C are correct
4. A, B and C are correct
Subtopic: Sliding Filament Theory |
93%
Level 1: 80%+
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What is the role of calcium ions in muscle contraction?
| 1. | They bind to troponin, changing its shape and removing the inhibition of actin by tropomyosin. |
| 2. | They directly bind to myosin, enabling it to bind to actin. |
| 3. | They increase the ATPase activity of myosin. |
| 4. | They form cross-bridges between actin and myosin filaments. |
Subtopic: Sliding Filament Theory |
87%
Level 1: 80%+
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Hints
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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), (e) only
2. (b), (d), (e), (a) only
3. (a), (c), (d), (e) only
4. (a), (b), (c), (d) only
Subtopic: Skeletal Muscle: Myofilaments | Sliding Filament Theory |
83%
Level 1: 80%+
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- 1(current)
Q. No.
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