Which one of the following statement is incorrect

Options

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

Explanation

To determine which statement is incorrect, let's analyze each statement one by one:

1. **Heart muscles are striated and involuntary.**
- Heart muscles, also known as cardiac muscles, do have striations (lines) and they function involuntarily (we do not consciously control them). Therefore, this statement is **correct**.

2. **Muscles of the hands and legs are striated and voluntary.**
- The muscles in the hands and legs are skeletal muscles, which are indeed striated and can be controlled voluntarily (we can decide to move them). Thus, this statement is also **correct**.

3. **Muscles located in the inner wall of the elementary canal are striated and involuntary.**
- The muscles in the inner wall of the elementary canal are smooth muscles, which are non-striated and involuntary. Therefore, this statement is **incorrect** because it incorrectly states that these muscles are striated.

4. **Muscles located in the reproductive tract are unstriated and involuntary.**
- The muscles in the reproductive tract are also smooth muscles, which are indeed non-striated and involuntary. Thus, this statement is **correct**.

Based on the analysis, the incorrect statement is the third one: "Muscles located in the inner wall of the elementary canal are striated and involuntary."

### Final Answer:
The incorrect statement is: **Muscles located in the inner wall of the elementary canal are striated and involuntary.**