- 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 |
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What protein is arranged along the length of actin filaments and is involved in regulation of skeletal muscle contraction?
| 1. | Troponin | 2. | Calmodulin |
| 3. | Tropomyosin | 4. | Light meromyosin |
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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 |
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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
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Which of the following masks the active sites on actin when a skeletal muscle is relaxed?
| 1. | Tropomyosin | 2. | Troponin |
| 3. | Calmodulin | 4. | Ubiquitin |
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During muscle contraction, the event shown in the following diagram describes:
1. cross bridge detachment
2. the power stroke or working stroke
3. cross bridge formation
4. cocking of myosin head
Cross bridge formation during muscle contraction involves:
| 1. | troponin and actin | 2. | tropomyosin and myosin |
| 3. | myosin and troponin | 4. | myosin and actin |
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| I. Sliding or rotation | A |
| II. Breaking of cross bridge | B |
| III. Formation of cross bridge | C |
| I | II | III | |
| 1. | B | A | C |
| 2. | B | C | A |
| 3. | A | B | C |
| 4. | C | A | B |
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Arrange the following events in correct chronological order:
a. acetylcholine hydrolyses into acetate and choline
b. acetylcholine diffuses across the synaptic cleft
c. Impulse reaches the terminal endings of the motor neuron
d. acetylcholine binds to its receptor on motor end plate
e. sarcolemma gets depolarized
| 1. | b, c, d, a, e | 2. | c, b, d, e, a |
| 3. | c, d, b, a, e | 4. | d, e, b, a, c |
- 1(current)
Q. No.
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