Why smooth muscles are called non-striated muscles?

Explanation

### Step-by-Step Solution:

1. **Definition of Smooth Muscles**: Smooth muscles are a type of muscle tissue found in various organs and structures within the body. They are characterized by their involuntary nature, meaning they operate without conscious control.

2. **Shape of Smooth Muscles**: Smooth muscle cells are spindle-shaped, which distinguishes them from other types of muscle tissues like skeletal muscles.

3. **Involuntary Control**: Unlike skeletal muscles, which are under voluntary control, smooth muscles function involuntarily. This means that their contractions are regulated by the autonomic nervous system and hormones.

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