Which of these is a striated muscle but not voluntary ?

Options

A. Abdominal muscle
B. Bisceps muscles
C. Wrist muscles
D. Cardiac muscles

Answer

To solve the question "Which of these is a striated muscle but not voluntary?", we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Types of Muscles**:
- There are three types of muscles in the human body:
- **Skeletal (Striated) Muscle**: Voluntary muscles that are under conscious control.
- **Cardiac Muscle**: Striated muscle found in the heart, which is involuntary.
- **Smooth Muscle**: Non-striated and involuntary muscles found in various organs.

2. **Analyze the Options**:
- **Option 1: Abdominal Muscles**:
- These are skeletal muscles and are voluntary. Thus, they do not fit the criteria.

- **Option 2: Biceps Muscles**:
- Biceps are also skeletal muscles, which are striated and voluntary. Therefore, this option is incorrect.

- **Option 3: Wrist Muscles**:
- Wrist muscles are primarily made up of skeletal muscles, which are striated and voluntary. So, this option is also incorrect.

- **Option 4: Cardiac Muscles**:
- Cardiac muscles are striated but are involuntary. They function without conscious control and are found in the heart. This fits the criteria of being striated but not voluntary.

3. **Conclusion**:
- Based on the analysis, the correct answer to the question is **Cardiac Muscles**.

### Final Answer:
**Cardiac Muscles** are striated muscles but not voluntary.