Which of the following muscles are under voluntary nervous control ?

Options

A. striated muscle
B. unstriated muscle
C. smooth muscles
D. cardiac muscles

Answer

To determine which of the following muscles are under voluntary nervous control, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Types of Muscles**:
- The options given are striated muscle, unstriated muscle, smooth muscle, and cardiac muscle.

2. **Examine Striated Muscle**:
- Striated muscles, also known as skeletal muscles, are under voluntary control. They are connected to bones and allow for movement. This means they operate under the somatic nervous system, which is responsible for voluntary movements.

3. **Examine Unstriated Muscle**:
- Unstriated muscles refer to smooth muscles. These muscles are not under voluntary control; they function involuntarily and are found in organs like the intestines and blood vessels.

4. **Examine Smooth Muscle**:
- Smooth muscles are indeed involuntary and are responsible for movements such as peristalsis in the digestive tract and constriction of blood vessels. They do not operate under voluntary control.

5. **Examine Cardiac Muscle**:
- Cardiac muscles are striated but are also involuntary. They make up the heart and function automatically without conscious control.

6. **Conclusion**:
- Based on the analysis, the only muscle type that is under voluntary nervous control is the **striated muscle** (skeletal muscle).

### Final Answer:
The muscles that are under voluntary nervous control are **striated muscles**.

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