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 the options provided and determine which muscle type fits the criteria of being striated and involuntary.

### Step-by-Step Solution:

1. **Understand the Types of Muscle Tissue**:
- There are three types of muscle tissues: skeletal (striated), cardiac (striated), and smooth (non-striated).
- Skeletal muscles are voluntary and striated, meaning they are under conscious control.
- Cardiac muscles are striated but involuntary, meaning they function without conscious control.
- Smooth muscles are non-striated and involuntary.

2. **Analyze the Options**:
- **Option 1: Abdominal Muscles**: These are skeletal muscles, which are striated and voluntary. Therefore, this option is incorrect.
- **Option 2: Bicep Muscles**: These are also skeletal muscles, striated and voluntary. Thus, this option is incorrect as well.
- **Option 3: Cardiac Muscles**: These muscles are striated but are involuntary. They are not under conscious control, which fits the criteria of the question.
- **Option 4: Smooth Muscles**: These are non-striated and involuntary, which does not meet the requirement of being striated.

3. **Conclusion**:
- The only muscle type that is striated and not voluntary is **Cardiac Muscles**. Therefore, the correct answer is **Option 3: Cardiac Muscles**.

### Final Answer:
**Option 3: Cardiac Muscles**