- 1(current)
Q. No.Which of the following regions within a sarcomere remain UNCHANGED in length when a healthy human muscle cell contracts?
(i) A-band
(ii) I-band
(ii) H-zone / band
1. 2 only
2. 3 only
3. 2 and 3 only
4. 1 only
(i) A-band
(ii) I-band
(ii) H-zone / band
1. 2 only
2. 3 only
3. 2 and 3 only
4. 1 only
Subtopic: Muscle Contraction: Other Considerations |
85%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
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: 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: Excitation Contraction Coupling I | Sliding Filament Theory | Muscle Contraction: Other Considerations |
87%
Level 1: 80%+
NEET - 2018
Hints
During shortening of the muscle, i.e., contraction:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | the ‘I’ bands get reduced |
| II: | the ‘A’ bands retain the length |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Skeletal Muscle: Sarcomere | Muscle Contraction: Other Considerations |
90%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Consider the given two statements:
| Statement I: | Repeated activation of the muscles can lead to fatigue. |
| Statement II: | Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them. |
| 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: Energy for Muscle Contraction | Muscle Contraction: Other Considerations |
89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
A skeletal muscle motor unit is best described as:
1. a section of myofibrils from Z lines to Z lines
2. one nerve fiber and all the muscle fibers innervated by that nerve fiber
3. all of the nerves that unite to make a whole muscle contract
4. all of the fascicles innervated by several neurons
1. a section of myofibrils from Z lines to Z lines
2. one nerve fiber and all the muscle fibers innervated by that nerve fiber
3. all of the nerves that unite to make a whole muscle contract
4. all of the fascicles innervated by several neurons
Subtopic: Sliding Filament Theory | Muscle Contraction: Other Considerations |
66%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.