What is the smallest cell in the human body ?

Options

A. White blood cell
B. Neuron
C. Nephron
D. Red blood cell

Answer

**Step-by-Step Solution:**

1. **Identify the Options**: The question provides four options to choose from:
- A) White blood cell
- B) Nephron
- C) Red blood cell
- D) Neuron

2. **Understand the Function and Size of Each Cell**:
- **White Blood Cell**: These cells are part of the immune system and are larger than red blood cells.
- **Nephron**: This is not a single cell but a functional unit of the kidney, consisting of many cells.
- **Red Blood Cell (RBC)**: These cells are responsible for transporting oxygen in the blood and are approximately 4 to 5 micrometers in size.
- **Neuron**: Neurons are nerve cells that are generally larger and more complex than red blood cells.

3. **Compare the Sizes**: Among the options, the red blood cell is the smallest. The typical size of an RBC is about 4 to 5 micrometers, which is smaller than the other cells listed.

4. **Conclusion**: Based on the size comparison and the functions of the cells, the smallest cell in the human body is the **Red Blood Cell (RBC)**.

5. **Final Answer**: Therefore, the correct answer is **C) Red Blood Cell (RBC)**.

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