The shape of smooth muscle fibre is

Options

A. Cylindrical
B. Fusiform
C. Oval
D. Round

Answer

**Step-by-Step Solution:**

1. **Identify the Types of Muscle Fibers**: There are three main types of muscle fibers in the human body: skeletal, cardiac, and smooth muscles. Each type has distinct characteristics.

2. **Characteristics of Skeletal Muscle**: Skeletal muscle fibers are striated and voluntary, and they have a cylindrical shape. These muscles are attached to the skeleton.

3. **Characteristics of Cardiac Muscle**: Cardiac muscle fibers are also striated but are involuntary. They are found in the heart and have a cylindrical shape similar to skeletal muscle.

4. **Characteristics of Smooth Muscle**: Smooth muscle fibers are non-striated and involuntary. They are found in the walls of hollow organs (viscera) such as the intestines and blood vessels.

5. **Shape of Smooth Muscle Fibers**: The shape of smooth muscle fibers is described as tapering at the ends, giving them a spindle-shaped or fusiform appearance. They have a single, oval nucleus located centrally within the fiber.

6. **Conclusion**: Based on the characteristics discussed, the correct answer to the question about the shape of smooth muscle fibers is that they are spindle-shaped (fusiform).

**Final Answer**: The shape of smooth muscle fiber is spindle-shaped (fusiform).

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