Select the option which gives the correct information about the white muscle fiber .

Options

A. The amount of endoplasmic reticulum is high and the number of Mitochondria is low
B. The amount of endoplasmic reticulum is high and the number of Mitochondria is also high
C. The amount of endoplasmic reticulum is low and the number of Mitochondria is high
D. The amount of endoplasmic reticulum is low and the number of Mitochondria is low

Answer

### Step-by-Step Solution:

1. **Understanding White Muscle Fibers**:
- White muscle fibers, also known as fast-twitch fibers, are specialized for rapid and powerful contractions. They are primarily used in activities that require quick bursts of energy.

2. **Characteristics of White Muscle Fibers**:
- **High Myosin ATPase Activity**: This allows for faster contraction and relaxation of the muscle fibers.
- **Low Mitochondria Count**: White muscle fibers rely more on anaerobic respiration for energy, which does not require a high number of mitochondria.
- **High Endoplasmic Reticulum**: The endoplasmic reticulum is involved in the synthesis of proteins and calcium storage, which is crucial for muscle contraction.

3. **Evaluating the Options**:
- **Option 1**: "The amount of endoplasmic reticulum is high and the number of mitochondria is low."
- This option is correct as it aligns with the characteristics of white muscle fibers.
- **Option 2**: "The amount of endoplasmic reticulum is high and the number of mitochondria is also high."
- This option is incorrect because white muscle fibers do not have a high number of mitochondria.
- **Option 3**: "The amount of endoplasmic reticulum is low."
- This option is incorrect since white muscle fibers have a high amount of endoplasmic reticulum.
- **Option 4**: "The amount of endoplasmic reticulum is low and the number of the mitochondria is low."
- This option is also incorrect for the same reason as option 3.

4. **Conclusion**:
- The correct answer is **Option 1**: "The amount of endoplasmic reticulum is high and the number of mitochondria is low."