Completely involuntary unstriated muscles occur in :-

Options

A. Base of pinna
B. Pylorus
C. Eye lids
D. Diaphragm

Answer

To answer the question "Completely involuntary unstriated muscles occur in:", we need to identify where smooth muscles, which are involuntary and unstriated, are found in the human body.

### Step-by-Step Solution:

1. **Understanding Muscle Types**:
- There are three types of muscles in the human body: skeletal, cardiac, and smooth.
- Skeletal muscles are voluntary and striated.
- Cardiac muscles are involuntary and striated.
- Smooth muscles are involuntary and unstriated.

2. **Identifying Smooth Muscles**:
- Smooth muscles are spindle-shaped, have a single nucleus, and lack striations.
- They are controlled involuntarily, meaning we do not consciously control their movements.

3. **Location of Smooth Muscles**:
- Smooth muscles are primarily found in the walls of visceral organs.
- Examples of visceral organs include the stomach, intestines, bladder, and blood vessels.

4. **Analyzing the Options**:
- The question likely provides multiple options. We need to determine which of these options are visceral organs where smooth muscles are found.
- For example, if the options include the pylorus (part of the stomach), it is a visceral organ and contains smooth muscles.

5. **Conclusion**:
- Based on the understanding that smooth muscles are found in visceral organs, the correct answer to the question would be the option that refers to a visceral organ, such as the pylorus.

### Final Answer:
- **Completely involuntary unstriated muscles occur in visceral organs, such as the pylorus.**