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

To solve the question regarding the correct information about white muscle fibers, let's analyze the options step by step.

### Step 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, such as sprinting or weightlifting.

### Step 2: Characteristics of White Muscle Fibers
1. **Energy Source**: White muscle fibers primarily rely on anaerobic metabolism. They obtain energy from glycogen stored in the muscle, which allows for quick energy release but does not require oxygen.
2. **Mitochondria Count**: White muscle fibers have a low number of mitochondria compared to red muscle fibers. Mitochondria are the sites of aerobic respiration, which is less utilized in white fibers.
3. **Endoplasmic Reticulum**: These fibers have a higher amount of endoplasmic reticulum, which is involved in the synthesis and storage of proteins and calcium ions, facilitating rapid muscle contraction.
4. **Myoglobin Content**: White muscle fibers contain low levels of myoglobin, which is the oxygen-binding protein found in muscle tissue. This is consistent with their reliance on anaerobic metabolism.

### Step 3: Analyzing the Options
Given the characteristics outlined above, we can evaluate the provided options:
- **Option 1**: "The amount of endoplasmic reticulum is high and the number of mitochondria is low." This statement aligns with the known characteristics of white muscle fibers.

### Conclusion
Based on the analysis, the correct information about white muscle fibers is that they have a high amount of endoplasmic reticulum and a low number of mitochondria.