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In which one of the following functions,...

In which one of the following functions, white muscles are not used ?
(a) Moving of eye balls
(b) Fast and strenuous work for short duration
(c) For sustained work at a slow rate for a prolonged duration
(d) Fast flights as in sparrows

A

Moving of eye balls

B

Fast and strenuous work for short duration

C

For sustained work at a slow rate for a prolonged duration

D

Fast flights as in sparrows

Text Solution

AI Generated Solution

The correct Answer is:
To determine in which function white muscles are not used, let's analyze each option step by step: 1. **Understanding White Muscles**: - White muscles, also known as fast-twitch muscle fibers, are primarily used for quick, powerful bursts of movement. They have a lower amount of myoglobin, fewer mitochondria, and a higher concentration of glycogen. This allows them to generate energy quickly but not sustain activity for long periods. 2. **Analyzing Each Option**: - **Option (a): Moving of eyeballs**: - The muscles responsible for moving the eyeballs are primarily slow-twitch muscle fibers (red muscles), which are suited for sustained, precise movements. Therefore, white muscles are not used in this function. - **Option (b): Fast and strenuous work for short duration**: - This function is characteristic of white muscles, as they are designed for quick, intense activities. Thus, white muscles are used here. - **Option (c): For sustained work at a slow rate for a prolonged duration**: - White muscles can perform sustained work but are not optimal for prolonged duration. However, they can still be involved in some capacity, so this is not the correct answer. - **Option (d): Fast flights as in sparrows**: - Fast-twitch muscles are involved in rapid movements, such as those required for flight. Therefore, white muscles are used in this function. 3. **Conclusion**: - Based on the analysis, the only function in which white muscles are not used is **(a) Moving of eyeballs**. ### Final Answer: **(a) Moving of eyeballs**
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