White muscle fibres exhibit

Options

A. Short term, high intensity contractions.
B. Short term, low intensity contractions.
C. Long term, high intensity contractions.
D. Long term, low intensity contractions.

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 for activities that require quick bursts of energy.

2. **Characteristics of White Muscle Fibers:**
- These fibers are characterized by their ability to perform short-term, high-intensity contractions. This means they can generate a lot of force quickly but cannot sustain this activity for long periods.

3. **Analyzing the Options:**
- **Option A:** Short term high intensity contraction - This is correct because white muscle fibers are designed for quick, powerful movements.
- **Option B:** Short term and low intensity contraction - This is incorrect as white muscle fibers are known for high intensity.
- **Option C:** Long term and high intensity contraction - This is incorrect because white muscle fibers do not sustain contractions for long periods.
- **Option D:** Long term and low intensity contraction - This is also incorrect as it does not describe the nature of white muscle fibers.

4. **Conclusion:**
- The correct answer is **Option A: Short term high intensity contraction**. White muscle fibers are efficient for quick, intense activities but are not suited for endurance.