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.
- Since the reason provided accurately explains why muscle fibers are classified this way, the correct option is Option A.
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Assertion (A): Muscle fibers are classified as red and white fibers ba...
Understanding Muscle Fibers
Muscle fibers are essential components of the muscular system, and they can be classified into two main types: red fibers and white fibers. This classification is primarily based on the amount of myoglobin present in each type.
Assertion (A): Muscle fibers are classified as red and white fibers based on the amount of myoglobin present in them.
- Red fibers, also known as slow-twitch fibers, contain a high concentration of myoglobin.
- White fibers, or fast-twitch fibers, have lower myoglobin levels.
Reason (R): Red fibers contain more myoglobin, which enhances their ability to store oxygen and sustain aerobic metabolism.
- Myoglobin is a protein that binds oxygen, allowing muscle cells to store oxygen for prolonged periods.
- The high myoglobin content in red fibers enables them to perform well during endurance activities, supporting aerobic metabolism.
Conclusion: Why Option A is Correct
Both the assertion and reason are true, and the reason provides a correct explanation for the assertion:
- The classification of muscle fibers based on myoglobin content directly correlates with their physiological functions.
- Red fibers' ability to store oxygen due to high myoglobin content is pivotal for their role in sustained aerobic activities.
In summary, the classification of muscle fibers as red and white indeed hinges on myoglobin levels, with red fibers excelling in oxygen storage and aerobic metabolism. Therefore, the correct answer is option 'A' because both statements are true, and the reason accurately explains the assertion.