Which of the following statements regarding muscles is correct?

Options

A. Striated muscle fibres are associated with locomotion while smooth muscle fibres are associated with internal organs
B. Smooth muscles are innervated by peripheral nervous system whereas, cardiac muscles fibres by autonomic nervous system
C. Striated muscle fibres are uniucleate while cardiac muscle fibres multinucleate
D. Striated muscles fibres and cardiac muscles fibres are voluntary.

Answer

To determine which statement regarding muscles is correct, let's analyze the options provided step by step.

**Step 1: Understand the Types of Muscle Fibers**
- There are three main types of muscle fibers: skeletal (or striated) muscles, smooth muscles, and cardiac muscles.
- Skeletal muscles are primarily associated with locomotion and are under voluntary control.
- Smooth muscles are found in internal organs and are involuntary.
- Cardiac muscles are found in the heart and are also involuntary.

**Step 2: Analyze Each Statement**
1. **Statement 1**: "Skeletal muscle fibers are associated with locomotion while smooth muscle fibers are associated with internal organs."
- This statement is correct. Skeletal muscles facilitate movement and locomotion, while smooth muscles control involuntary movements in internal organs.

2. **Statement 2**: "Smooth muscles are innervated by the peripheral nervous system whereas cardiac muscle fibers by the autonomic nervous system."
- This statement is incorrect. Smooth muscles are indeed innervated by the autonomic nervous system, not the peripheral nervous system. Cardiac muscle fibers are also innervated by the autonomic nervous system.

3. **Statement 3**: "Skeletal muscle fibers are uninucleated while cardiac muscle fibers are multinucleated."
- This statement is incorrect. Skeletal muscle fibers are multinucleated, while cardiac muscle fibers are typically uninucleated (though they can be binucleated).

4. **Statement 4**: "Skeletal muscle fibers and cardiac muscle fibers are voluntary."
- This statement is incorrect. Skeletal muscle fibers are voluntary, but cardiac muscle fibers are involuntary.

**Step 3: Conclusion**
- After analyzing all statements, only Statement 1 is correct.

**Final Answer**: The correct statement regarding muscles is: "Skeletal muscle fibers are associated with locomotion while smooth muscle fibers are associated with internal organs."

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