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 inner walls of alimentary canal are striated and involuntary
D. Muscles located in inner walls of alimentary canal are smooth and involuntary

Explanation

To determine which statement is incorrect, we will analyze each statement provided in the question step by step.

### Step 1: Analyze the First Statement
**Statement:** Heart muscles are striated and involuntary.
- **Explanation:** Heart muscles, also known as cardiac muscles, are indeed striated (they have a banded appearance) and are involuntary (they function without conscious control).
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** The muscles of the hands and legs are striated and involuntary.
- **Explanation:** The muscles in the hands and legs are primarily skeletal muscles. These muscles are striated and are under voluntary control (meaning they can be consciously controlled).
- **Conclusion:** This statement is **incorrect** because while the muscles are striated, they are not involuntary.

### Step 3: Analyze the Third Statement
**Statement:** The muscles located in the inner wall of the alimentary canal are striated and involuntary.
- **Explanation:** The muscles in the inner wall of the alimentary canal are smooth muscles, which are non-striated and involuntary.
- **Conclusion:** This statement is **incorrect** as well, but it is important to note that the muscles in the alimentary canal are smooth and involuntary.

### Step 4: Analyze the Fourth Statement
**Statement:** The muscles located in the inner wall of the alimentary canal are smooth and involuntary.
- **Explanation:** This statement accurately describes the muscles in the alimentary canal. These muscles are indeed smooth and involuntary.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
From the analysis, the second statement is incorrect because it incorrectly states that the muscles of the hands and legs are involuntary when they are, in fact, voluntary.

### Answer: The incorrect statement is the second one: "The muscles of the hands and legs are striated and involuntary."

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