Which of the following formed element has S shape nucleus ?

Options

A. Eosinophil
B. Basophil
C. Neutrophil
D. Lymphocyte

Answer

To determine which formed element has an S-shaped nucleus, we can analyze the different types of white blood cells (leukocytes) based on their nuclear shapes. Here’s a step-by-step solution:

### Step 1: Identify the Types of Formed Elements
The formed elements in the blood include:
- Eosinophils
- Basophils
- Neutrophils
- Lymphocytes

### Step 2: Examine the Nucleus of Each Formed Element
1. **Eosinophils**: Eosinophils typically have a bilobed nucleus, which means their nucleus has two distinct lobes. This does not match the S-shape.

2. **Basophils**: Basophils have a nucleus that is often described as S-shaped or lobulated. This is a key characteristic that distinguishes them from other leukocytes.

3. **Neutrophils**: Neutrophils possess a nucleus that can have 2 to 5 lobes, but it does not have the S-shape characteristic.

4. **Lymphocytes**: Lymphocytes have a round nucleus that occupies most of the cell's volume, which is not S-shaped.

### Step 3: Conclusion
Based on the analysis above, the formed element with an S-shaped nucleus is **Basophils**. Therefore, the correct answer is option **Basophils**.

### Final Answer
The formed element that has an S-shaped nucleus is **Basophils**.

---