Which muscle located in the inner wall of hollow visceral organs of the body like the alimentary canal, reproductive tract, etc?

Options

A. Skeletal muscle
B. Smooth muscle
C. Striated muscle
D. voluntary muscle

Answer

**Step-by-Step Solution:**

1. **Understanding Muscle Types**:
- There are three main types of muscles in the human body: skeletal, cardiac, and smooth muscles.
- Skeletal muscles are voluntary and are attached to bones, allowing for movement.
- Cardiac muscles are found in the heart and are also involuntary.
- Smooth muscles are involuntary and are found in the walls of hollow visceral organs.

2. **Identifying the Location of Smooth Muscles**:
- Smooth muscles are specifically located in the inner walls of hollow organs such as the alimentary canal (digestive tract), reproductive tract, blood vessels, and other internal organs.
- These muscles help in processes like peristalsis in the digestive system, which is the wave-like motion that moves food through the gut.

3. **Characteristics of Smooth Muscles**:
- Smooth muscles are spindle-shaped (fusiform), meaning they are thicker in the middle and taper at the ends.
- They are uninucleated, having a single nucleus per cell, and the cells are not fused together, allowing for independent contraction.

4. **Analyzing the Options**:
- Option 1: Skeletal muscle - Incorrect, as these are voluntary muscles attached to bones.
- Option 2: Smooth muscle - Correct, as these are involuntary muscles found in the walls of hollow visceral organs.
- Option 3: Striated muscle - Incorrect, as smooth muscles are unstriated (do not have alternating dark and light bands).
- Option 4: Voluntary muscle - Incorrect, as smooth muscles are involuntary.

5. **Conclusion**:
- The muscle located in the inner wall of hollow visceral organs like the alimentary canal and reproductive tract is **smooth muscle**.

**Final Answer**: The correct answer is **2. Smooth muscle**.

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