Which one of the following statement is incorrect?

Options

A. Heart muscles are striated and invol- untary
B. The muscles of hands and legs are stri- ated and voluntary
C. The muscles located in the inner walls of alimentary canal are striated and in- voluntary
D. Muscles located in the reproductive tracts are unstriated and involuntary

Answer

To solve the question regarding which statement is incorrect about muscle types, we will analyze each statement one by one based on our knowledge of muscle physiology.

### Step-by-Step Solution:

1. **Understanding Muscle Types**:
- There are three main types of muscles:
- **Skeletal (Voluntary)**: Striated and under conscious control.
- **Cardiac (Involuntary)**: Striated and found in the heart, not under conscious control.
- **Smooth (Involuntary)**: Non-striated and found in the walls of internal organs, not under conscious control.

2. **Analyzing Each Statement**:
- **Statement 1**: "Heart muscles are striated and involuntary."
- **Analysis**: This statement is correct. Cardiac muscles are indeed striated and involuntary.

- **Statement 2**: "The muscles of hands, legs are striated and involuntary."
- **Analysis**: This statement is incorrect. The muscles of the hands and legs are skeletal muscles, which are striated and voluntary, not involuntary.

- **Statement 3**: "The muscles located in the inner walls of the alimentary canal are striated and involuntary."
- **Analysis**: This statement is incorrect. The muscles in the alimentary canal are smooth muscles, which are non-striated and involuntary.

- **Statement 4**: "Muscles located in the reproductive tracts are un-striated and involuntary."
- **Analysis**: This statement is correct. The muscles in the reproductive tracts are smooth (non-striated) and involuntary.

3. **Identifying the Incorrect Statement**:
- From the analysis, we see that Statement 2 and Statement 3 are incorrect. However, the question asks for one incorrect statement. Since Statement 2 is more directly incorrect regarding the classification of skeletal muscles, we can conclude that it is the primary incorrect statement.

### Conclusion:
The incorrect statement is: **"The muscles of hands, legs are striated and involuntary."**