Non nucleated blood cells in human blood are  

Options

A. WBC & platelets
B. Platelets & neutrophils
C. RBC & platelets
D. Platelets & monocytes

Answer

To answer the question "Non-nucleated blood cells in human blood are:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Non-Nucleated Cells**:
- Non-nucleated cells are cells that do not have a nucleus. In the context of blood cells, we need to identify which types of blood cells lack a nucleus.

2. **Identifying Blood Cell Types**:
- The main types of blood cells are:
- Red Blood Cells (RBCs)
- White Blood Cells (WBCs)
- Platelets

3. **Analyzing Each Cell Type**:
- **Red Blood Cells (RBCs)**:
- RBCs are also known as erythrocytes. They are non-nucleated and their primary function is to carry oxygen throughout the body. They lack a nucleus to maximize space for hemoglobin, which is essential for oxygen transport.
- **White Blood Cells (WBCs)**:
- WBCs, or leukocytes, are nucleated cells. They play a crucial role in the immune response and help the body fight infections.
- **Platelets**:
- Platelets are cell fragments derived from megakaryocytes in the bone marrow. They are also considered non-nucleated.

4. **Evaluating the Options**:
- Given the options:
- **Option A**: WBC and Platelets (Incorrect, WBCs are nucleated)
- **Option B**: Platelets and Neutrophils (Incorrect, Neutrophils are a type of WBC and are nucleated)
- **Option C**: RBC and Platelets (Correct, both are non-nucleated)
- **Option D**: Platelets and Monocytes (Incorrect, Monocytes are a type of WBC and are nucleated)

5. **Conclusion**:
- The only non-nucleated blood cells in human blood are Red Blood Cells (RBCs) and Platelets. Therefore, the correct answer is **Option C: RBC and Platelets**.