Smooth muscles are

Options

A. involuntary, fusiform, non-striated
B. voluntary, multinucleate, cylindrical
C. involuntary, cylindrical, striated
D. voluntary, spindle-shaped,uniuncleate

Answer

**Step-by-Step Solution:**

1. **Understanding Smooth Muscles:**
- Smooth muscles are a type of muscle tissue found in the walls of hollow internal organs such as the stomach, intestines, ureters, and urinary bladder.

2. **Characteristics of Smooth Muscles:**
- **Involuntary:** Smooth muscles operate without conscious control, meaning they are involuntary.
- **Fusiform Shape:** The cells are spindle-shaped (fusiform) which means they are wider in the middle and taper at both ends.
- **Non-Striated:** Unlike skeletal muscles, smooth muscles do not have striations (light and dark bands) due to the arrangement of actin and myosin filaments.

3. **Analyzing the Options:**
- **Option A:** Involuntary, fusiform, non-striated - This is correct based on the characteristics of smooth muscles.
- **Option B:** Voluntary, multinucleated, cylindrical - This is incorrect as smooth muscles are involuntary and uninucleated.
- **Option C:** Involuntary, cylindrical, striated - This is incorrect as smooth muscles are not cylindrical and are non-striated.
- **Option D:** Voluntary, spindle-shaped, uninucleated - This is incorrect because smooth muscles are involuntary.

4. **Conclusion:**
- The correct answer is **Option A: involuntary, fusiform, non-striated**.