- 1(current)
Q. No.As the distance from Z line to Z line decreases, which bands shorten in a sarcomere?
| 1. | the I band and H band | 2. | the I band and A band |
| 3. | the A band and H band | 4. | all bands shorten |
Subtopic: Â Sliding Filament Theory |
 88%
Level 1: 80%+
Hints
During relaxation of a skeletal muscle:
| 1. | Calcium ions that are bound to troponin C now bind to troponin A |
| 2. | Cross bridge formation between myosin head and actin takes place |
| 3. | The A band of the sarcomere lengthens |
| 4. | Calcium ions are pumped back to the sarcoplasmic cisternae |
Subtopic: Â Sliding Filament Theory |Â Energy for Muscle Contraction |
 84%
Level 1: 80%+
Hints
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During muscle contraction, when the myosin head releases ADP and iP it:
1. forms cross bridge with actin
2. pulls actin towards M-line
3. goes back to its relaxed state
4. gets detached from the cross bridge
Subtopic: Â Sliding Filament Theory |Â Energy for Muscle Contraction |
Level 3: 35%-60%
Hints
Which of the following masks the active sites on actin when a skeletal muscle is relaxed?
| 1. | Tropomyosin | 2. | Troponin |
| 3. | Calmodulin | 4. | Ubiquitin |
Subtopic: Â Sliding Filament Theory |Â Energy for Muscle Contraction |
 86%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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