Q. No.
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When a bone bends and cracks, instead of breaking completely into separate pieces, the fracture is called as:
1. greenstick
2. incomplete
3. compound
4. simple
The critical event for the contraction of striated muscles would be that calcium ions:
| 1. | are released from troponin C |
| 2. | bind to tropomyosin |
| 3. | bind to troponin |
| 4. | are taken up by the sarcoplasmic reticulum |
All the following shorten during muscle contraction except:
1. sarcomere
2. A bands
3. I bands
4. H bands
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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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For the muscular movements to be coordinated, it is important that:
1. the muscle twitches must be of increasing strength.
2. muscle is divided into motor units
3. type I fibers must be more than type II fibers in a muscle
4. the muscle twitches undergo tetanization.
Calcium, vital for muscle contraction, is stored in:
1. transverse tubules
2. myosin head
3. myofibrils
4. sarcoplasmic reticulum
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Identify the correct statement regarding the use of ATP in muscle contraction:
1. ATP cannot be directly used for muscle contraction.
2. ATP is not required for muscle relaxation.
3. When ATP is hydrolyzed, the conformation of myosin is changed.
4. Once the cross-bridge is formed, the hydrolysis of ATP initiates the power stroke.
Classification of joints is done on the basis of:
| I: | the connective tissue that binds the bones together |
| II: | the degree of motion at each joint |
| III: | the number of bones that articulate with each other |
| IV: | the embryonic tissue that formed the joint |
| 1. | I, II and III | 2. | II and III |
| 3. | I, II, III and IV | 4. | I and II |
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