- 1(current)
Q. No.The A band during muscle contraction:
| 1. | Remains constant in length |
| 2. | Increases in length |
| 3. | Decreases in length |
| 4. | Disappears |
Subtopic: Â Mechanism of muscle contraction |
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Level 1: 80%+
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During muscle contraction, the release of which specific ions initiates the interaction between actin and myosin?
1. Calcium ions
2. Sodium ions
3. Potassium ions
4. Magnesium ions
1. Calcium ions
2. Sodium ions
3. Potassium ions
4. Magnesium ions
Subtopic: Â Mechanism of muscle contraction |
 92%
Level 1: 80%+
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During contraction of a skeletal muscle fibre, which statement best represents the behaviour of sarcomere components?
| 1. | I band decreases as thin filaments slide toward the centre while A band remains constant |
| 2. | A band shortens due to compression of thick filaments while I band remains unchanged |
| 3. | Both A and I bands reduce equally when actin filaments contract |
| 4. | A band enlarges and I band becomes constant as myosin heads pivot |
Subtopic: Â Mechanism of muscle contraction |
 86%
Level 1: 80%+
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- 1(current)
Q. No.
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