Muscles with characteristic striations and involuntary are

Options

A. muscles in the wall of alimentary canal
B. muscles of the heart
C. muscles assisting locomotion
D. muscles of the eyelids

Answer

To solve the question, "Muscles with characteristic striations and involuntary are," we need to analyze the options provided and determine which type of muscle fits the description of being both striated and involuntary.

### Step-by-Step Solution:

1. **Understand Muscle Types**:
- Muscles can be classified into three types:
- **Striated (Skeletal) Muscles**: These are under voluntary control and have a banded appearance (striations).
- **Smooth (Non-Striated) Muscles**: These are involuntary and do not have striations. They are found in the walls of hollow organs like the alimentary canal.
- **Cardiac Muscles**: These are striated but involuntary, found only in the heart.

2. **Analyze Each Option**:
- **Option A: Muscles in the wall of the alimentary canal**:
- These are smooth muscles, which are involuntary but do not have striations.
- **Conclusion**: Incorrect option.

- **Option B: Muscles of the heart**:
- These are cardiac muscles, which are striated and involuntary.
- **Conclusion**: Correct option.

- **Option C: Muscles assisting locomotion**:
- These are skeletal muscles, which are striated and under voluntary control.
- **Conclusion**: Incorrect option.

- **Option D: Muscles of the eyelid**:
- These are also skeletal muscles, which are striated and voluntary.
- **Conclusion**: Incorrect option.

3. **Final Conclusion**:
- Based on the analysis, the only type of muscle that is both striated and involuntary is the **muscles of the heart** (Option B).

### Final Answer:
**Option B: Muscles of the heart**

---