Q. No.The neuromuscular junction, the site where a motor neuron communicates with a muscle fiber to initiate contraction, involves the release of:
| 1. | Dopamine | 2. | Acetylcholine |
| 3. | Serotonin | 4. | Glutamate |
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
96%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Choose the correct option to complete the analogy w.r.t. muscle contraction.
Mitochondria : ATP :: Sarcoplasmic reticulum : _____________
1. Ca2+
2. Mg2+
3. Fats
4. Proteins
Mitochondria : ATP :: Sarcoplasmic reticulum : _____________
1. Ca2+
2. Mg2+
3. Fats
4. Proteins
Subtopic: Muscle Contraction: Other Considerations |
95%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
A neural signal reaching the neuromuscular junction releases …………. which generates an action potential in the ………..
| 1. | Acetylcholine, Sarcolemma |
| 2. | Inositol, Sarcolemma |
| 3. | GABA, Sarcoplasmic reticulum |
| 4. | GABA, Sarcoplasm |
Subtopic: Muscle Contraction: Other Considerations |
96%
Level 1: 80%+
Hints
Muscle fatigue is primarily attributed to the accumulation of which metabolic by-product?
| 1. | Lactic acid | 2. | ATP |
| 3. | Glucose | 4. | Glycogen |
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
93%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which muscle type is more likely to contain abundant mitochondria and rely on aerobic processes for energy?
| 1. | White muscle fibres | 2. | Red muscle fibres |
| 3. | Smooth muscle fibres | 4. | Cardiac muscle fibres |
Subtopic: Muscle Contraction: Other Considerations |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which ion is critical for muscle contraction and binds to troponin to enable actin-myosin interaction?
1. Sodium
2. Potassium
3. Magnesium
4. Calcium
1. Sodium
2. Potassium
3. Magnesium
4. Calcium
Subtopic: Muscle Contraction: Other Considerations |
94%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
During muscle contraction, which of the following retains its length?
1. Sarcomere
2. I-bands
3. A-bands
4. H-zones
1. Sarcomere
2. I-bands
3. A-bands
4. H-zones
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
| Statement I: | Calcium ions play a crucial role in muscle contraction. |
| Statement II: | Calcium ions bind to troponin, causing conformational changes that expose binding sites on actin. |
| 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 | Muscle Contraction: Other Considerations |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
During muscle contraction, which of the following bands or zones remains constant in length?
| 1. | A-band | 2. | I-band |
| 3. | H-zone | 4. | Z-line |
Subtopic: Skeletal Muscle: Sarcomere | Sliding Filament Theory | Muscle Contraction: Other Considerations |
90%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The compound or pigment acting as an oxygen store in skeletal muscles is:
| 1. | Myoglobin | 2. | Haemoglobin |
| 3. | Myokinase or ATP | 4. | Cytochrome |
Subtopic: Muscle Contraction: Other Considerations |
88%
Level 1: 80%+
Hints
© 2026 GoodEd Technologies Pvt. Ltd.