Muscle immune to fatigue are

Options

A. Striped
B. Unstriped
C. Cardiac
D. Eye muscles.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks which type of muscle is immune to fatigue. This implies we need to identify a muscle type that can sustain activity without tiring quickly.

2. **Identifying Muscle Types:**
The options provided are:
- Striped muscle
- Unstriped muscle
- Cardiac muscle
- Eye muscle

3. **Analyzing Each Option:**
- **Striped Muscle:** This refers to skeletal muscles which are voluntary and can fatigue after prolonged use.
- **Unstriped Muscle:** This refers to smooth muscles which are involuntary but can also fatigue under certain conditions.
- **Cardiac Muscle:** This is the muscle of the heart, which is involuntary and designed to work continuously without tiring.
- **Eye Muscle:** These are also skeletal muscles and can fatigue.

4. **Determining the Correct Answer:**
Among the options, cardiac muscle is unique because it contains a high number of mitochondria, which provide energy efficiently. This allows it to function continuously without fatigue.

5. **Conclusion:**
The muscle that is immune to fatigue is the **cardiac muscle** (Option 3).

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