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Q. No.Calcium released into the sarcoplasm during muscle contraction:
1.
binds to the actin and myosin and makes them work together.
2.
breaks apart ATP to ADP and P.
3.
removes the tropomyosin block.
4.
causes the release of acetylcholine.
Subtopic: Sliding Filament Theory |
62%
From NCERT
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To form a cross bridge, during muscle contraction:
| 1. | the myosin head binds to the exposed active sites on actin utilising the energy from ATP hydrolysis |
| 2. | the myosin head binds to the exposed active sites on actin and then the ATP binds to its site on myosin head |
| 3. | the actin binds to the exposed active sites on myosin head utilising the energy from ATP hydrolysis |
| 4. | the actin binds to the exposed active sites on myosin head and then the ATP binds to its site on actin |
Subtopic: Sliding Filament Theory |
73%
From NCERT
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During shortening of the muscle, i.e., contraction:
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
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%
From NCERT
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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%
From NCERT
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Which of the following is not included in human axial skeleton?
1. The skull
2. The vertebral column
3. The sternum
4. The clavicle
1. The skull
2. The vertebral column
3. The sternum
4. The clavicle
Subtopic: Appendicular Skeleton |
91%
From NCERT
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Consider the given two statements:
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
| Statement I: | A single U-shaped bone called hyoid is present at the base of the buccal cavity and it provides attachment to the tongue. |
| Statement II: | The skull region articulates with the superior region of the vertebral column with the help of two occipital condyles (dicondylic skull). |
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: Axial Skeleton |
81%
From NCERT
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The vertebral column is differentiated into:
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
| I: | cervical region with 7 vertebrae |
| II: | thoracic region with 12 vertebrae (12) |
| III: | lumbar region with 4 vertebrae |
| IV: | sacral (2-fused) and coccygeal (2-fused) regions |
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic: Axial Skeleton |
93%
From NCERT
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Consider the two statements:
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
| Statement I: | Each rib is a thin flat bone connected ventrally to the vertebral column and dorsally to the sternum. |
| Statement II: | Each rib has two articulation surfaces on its ventral end and is hence called bicephalic. |
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: Sternum & Ribs | Axial Skeleton |
67%
From NCERT
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The number of correct statement(s) regarding human adult skeleton from the given statements is/are:
1. 2
2. 3
3. 4
4. 5
| I: | Each limb is made of 30 bones. |
| II: | Carpals are 8 in number |
| III: | Tarsals are 7 in number |
| IV: | Metacarpals are 5 in number |
| V: | Metatarsals are 4 in number |
1. 2
2. 3
3. 4
4. 5
Subtopic: Appendicular Skeleton |
83%
From NCERT
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Clavicle:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | is a part of the pectoral girdle. |
| II: | articulates with acromion process of scapula and with sternum |
| III: | is commonly called the collar bone. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Appendicular Skeleton |
70%
From NCERT
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