- 1(current)
Q. No.During muscle contraction, the part that does not get shortened in length is labeled as the letter:
| 1. A | 2. B |
| 3. C | 4. D |
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What happens during the contraction of a skeletal muscle fiber?
| 1. | The myosin filaments stay the same size but the actin filaments shorten |
| 2. | The sarcomeres shorten |
| 3. | The actin filaments stay the same size but the myosin filaments shorten |
| 4. | Both actin and myosin filaments shorten |
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| I: | Repeated activation of muscles can lead to fatigue. |
| II: | Repeated activation of muscles can lead to accumulation of lactic acid. |
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. I is incorrect but II is correct
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| Assertion (A): | Shortening of myofilaments leads to the shortening of the muscle. |
| Reason (R): | Only the actin myofilaments shorten while the length of the myosin myofilaments remains the same during the muscle shortening. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- 1(current)
Q. No.
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