Which of the following features is not applicable for red muscle fibres ?

Options

A. It has high content of red colour oxygen storing pigment myoglobin . .
B. It also contains plenty of Mitochondria for maximum ATP production .
C. It has also high amount of sarcoplasmic reticulum .
D. It is also called as aerobic muscles.

Answer

To solve the question, "Which of the following features is not applicable for red muscle fibres?", we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Red Muscle Fibres**: Red muscle fibres, also known as slow-twitch fibres, are characterized by their high myoglobin content, numerous mitochondria, and reliance on aerobic metabolism.

2. **Analyzing the Options**:
- **Option 1**: "High content of red color oxygen-storing pigment myoglobin."
- **Analysis**: This is true for red muscle fibres. They have a high concentration of myoglobin, which helps in oxygen storage and transport.

- **Option 2**: "Contains plenty of mitochondria for maximum ATP production."
- **Analysis**: This is also true. Red muscle fibres have many mitochondria, which are essential for aerobic respiration and ATP production.

- **Option 3**: "High amount of sarcoplasmic reticulum."
- **Analysis**: This statement is not true for red muscle fibres. Red muscle fibres have less sarcoplasmic reticulum compared to white muscle fibres, which are more involved in quick, powerful contractions.

- **Option 4**: "Also called as aerobic muscle."
- **Analysis**: This is true. Red muscle fibres are indeed referred to as aerobic muscles because they primarily rely on aerobic metabolism.

3. **Conclusion**: The feature that is not applicable for red muscle fibres is the high amount of sarcoplasmic reticulum (Option 3).

### Final Answer:
The correct answer is **Option 3**: "High amount of sarcoplasmic reticulum."

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