Assertion (A): Muscle fibers are classified as red and white fibers ba...
Understanding Muscle Fiber Classification
Muscle fibers are primarily classified based on their biochemical properties, particularly the presence of myoglobin. This classification is crucial in understanding muscle function and performance.
Assertion (A) Explained
- Muscle fibers are indeed classified as red and white fibers.
- The classification is based on the amount of myoglobin present in them.
Reason (R) Explained
- Red fibers, also known as slow-twitch fibers, contain a higher amount of myoglobin.
- This increased myoglobin allows red fibers to store more oxygen, which is essential for aerobic metabolism.
- Aerobic metabolism is important for endurance activities, as it provides energy over extended durations.
Correctness of Assertion and Reason
- Both Assertion (A) and Reason (R) are true.
- However, while Reason (R) provides a valid explanation for the classification, it does not encompass all aspects of muscle fiber classification. Other factors like fiber type, contraction speed, and fatigue resistance also play roles in differentiating red and white fibers.
Conclusion
- Hence, while both statements are true, the reason does not fully explain the assertion since the classification of muscle fibers is based on multiple criteria.
- Therefore, the correct answer is option 'B': both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Assertion (A): Muscle fibers are classified as red and white fibers ba...
- Assertion (A) is true: Muscle fibers are indeed classified into red and white fibers based on myoglobin content.
- Reason (R) is also true: Red fibers do contain more myoglobin, which allows for better oxygen storage and supports aerobic metabolism.
-Reason is just describing about red fibres.If it would have mentioned description of white fibres then the reason would have become the correct explanation of the assertion
Topic in NCERT: MUSCLE FIBRES
Line in NCERT: "Muscles are classified as Red and White fibres based primarily on the amount of red coloured myoglobin pigment in them."