- 1(current)
Q. No.Stimulation of a muscle fiber by a motor neuron occurs at:
1. the neuromuscular junction
2. the transverse tubules
3. the myofibril
4. the sarcoplasmic reticulum
Subtopic: Â Muscle Contraction: Other Considerations |
 92%
Level 1: 80%+
AIPMT - 2014
Hints
Calcium is important in skeletal muscle contraction because it:
| 1. | binds to troponin to remove the masking of active sites on actin for myosin. |
| 2. | activates the myosin ATPase by binding to it. |
| 3. | detaches the myosin head from the actin filament. |
| 4. | prevents the formation of bonds between the myosin cross bridges and the actin filament. |
Subtopic: Â Excitation Contraction Coupling I |Â Sliding Filament Theory |Â Muscle Contraction: Other Considerations |
 87%
Level 1: 80%+
NEET - 2018
Hints
Select the correct statements regarding mechanism of muscle contraction.
Choose the most appropriate answer from the options given below:
1. B, C and E only
2. C, D and E only
3. A and D only
4. B, D and E only
| A. | It is initiated by a signal sent by CNS via sensory neuron. |
| B. | Neurotransmitter generates action potential in the sarcolemma. |
| C. | Increased Ca++ level leads to the binding of calcium with troponin actin filaments. |
| D. | Masking of active site for actin is activated. |
| E. | Utilising the energy from ATP hydrolysis to form cross bridge. |
1. B, C and E only
2. C, D and E only
3. A and D only
4. B, D and E only
Subtopic: Â Sliding Filament Theory |Â Muscle Contraction: Other Considerations |
 75%
Level 2: 60%+
NEET - 2024
Hints
- 1(current)
Q. No.
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