Which one of the following statements is incorrect?

Options

A. Heart muscls are striated and involuntary
B. The muscles of hands and legs are striated and voluntary
C. The muscles 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 regarding muscle types in the human body, we will analyze each option based on our understanding of skeletal, smooth, and cardiac muscles.

### Step-by-Step Solution:

1. **Identify Muscle Types**:
- **Skeletal Muscles**: These are striated, voluntary muscles that are attached to bones and can be controlled consciously. Examples include muscles in the arms and legs.
- **Smooth Muscles**: These are non-striated, involuntary muscles found in internal organs (like the digestive tract) and cannot be controlled consciously.
- **Cardiac Muscles**: These are striated, involuntary muscles found in the heart. They are unique in structure as they are branched.

2. **Analyze Each Statement**:
- **Statement A**: "Heart muscles (cardiac muscles) are striated and involuntary."
- This statement is **correct**. Cardiac muscles are indeed striated and involuntary.

- **Statement B**: "Muscles of hands and legs are striated and involuntary."
- This statement is **incorrect**. Muscles of the hands and legs are striated but they are **voluntary**, not involuntary.

- **Statement C**: "Muscles of inner walls of the elementary canal are striated and involuntary."
- This statement is **incorrect**. The muscles in the inner walls of the elementary canal are smooth (non-striated) and involuntary.

- **Statement D**: "Muscles in the reproductive tract are unstriated and involuntary."
- This statement is **correct**. The muscles in the reproductive tract are indeed smooth (unstriated) and involuntary.

3. **Conclusion**:
- The incorrect statement among the options is **Statement C**: "Muscles of inner walls of elementary canal are striated and involuntary." This is incorrect because these muscles are smooth and involuntary, not striated.

### Final Answer:
The incorrect statement is **C**: "Muscles of inner walls of elementary canal are striated and involuntary."

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