Q. No.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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Abnormal curvature of the vertebral column where the alignment shows a lateral deviation is called as:
| 1. | kyphosis | 2. | lordosis |
| 3. | scoliosis | 4. | ankylosis |
The superior and inferior radioulnar joints are examples of
| 1. | gliding joint | 2. | hinge joint |
| 3. | condyloid joint | 4. | pivot joint |
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What type of muscles do you expect to find in the inner walls of hollow visceral organs?
| 1. | Involuntary, nonstriated | 2. | Voluntary, nonstriated |
| 3. | Involuntary, striated | 4. | Voluntary, striated |
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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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1. poliomyelitis
2. myasthenia gravis
3. multiple sclerosis
4. muscular dystrophy
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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
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