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
1. Dopamine
2. Acetylcholine
3. Serotonin
4. Glutamate
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
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Level 1: 80%+
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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 |
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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 |
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Muscle fatigue is primarily attributed to the accumulation of which metabolic by-product?
1. Lactic acid
2. ATP
3. Glucose
4. Glycogen
1. Lactic acid
2. ATP
3. Glucose
4. Glycogen
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
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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
1. White muscle fibres
2. Red muscle fibres
3. Smooth muscle fibres
4. Cardiac muscle fibres
Subtopic: Muscle Contraction: Other Considerations |
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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 |
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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 |
91%
Level 1: 80%+
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Consider the given two statements:
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
| 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. |
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%+
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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
1. A-band
2. I-band
3. H-zone
4. Z-line
Subtopic: Skeletal Muscle: Sarcomere | Sliding Filament Theory | Muscle Contraction: Other Considerations |
90%
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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%+
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