Originating in bone marrow, circulating in blood for 1-2 days, migrating to connective tissue and forming macrophages is a characteristic of

Options

A. eosinophils
B. eosinophils
C. monocytes
D. lymphocytes

Answer

To solve the question, we need to identify the type of cell that originates in the bone marrow, circulates in the blood for a short period, and then migrates to connective tissue to become macrophages.

### Step-by-Step Solution:

1. **Identify the Origin**: The question states that the cell originates in the bone marrow. This is a key characteristic of certain types of white blood cells (WBCs), particularly monocytes.

2. **Circulation in Blood**: The next part of the question mentions that the cell circulates in the blood for 1-2 days. Monocytes are known to circulate in the bloodstream for about 1-3 days before they migrate to tissues.

3. **Migration to Connective Tissue**: After circulating in the blood, the monocytes migrate to connective tissues. Once they enter the tissues, they differentiate into macrophages, which are crucial for immune response and tissue homeostasis.

4. **Formation of Macrophages**: The final part of the question highlights that these cells form macrophages after migrating to connective tissues. This is a definitive characteristic of monocytes, as they transform into macrophages upon entering tissues.

5. **Conclusion**: Based on the above points, the cell that fits all these characteristics is the **monocyte**.

### Final Answer:
The characteristic described in the question is that of **monocytes**.