Leukocytes can squeeze out of blood capillaries. This process is called

Options

A. leucocytosis
B. thrombopoiesis
C. diapedesis
D. haemopoiesis

Answer

To answer the question about the process through which leukocytes can squeeze out of blood capillaries, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the specific term that describes the process by which leukocytes (white blood cells) exit the bloodstream and enter surrounding tissues.

2. **Identify the Options**: The options given are:
- A) Leukocytosis
- B) Thrombopoiesis
- C) Diapetesis
- D) Hemopoiesis

3. **Analyze Each Option**:
- **Leukocytosis**: This term refers to an increase in the number of leukocytes in the blood, not their movement out of capillaries.
- **Thrombopoiesis**: This refers to the formation of platelets (thrombocytes) from megakaryocytes in the bone marrow, which is unrelated to leukocyte movement.
- **Hemopoiesis**: This is the process of blood cell formation, including red blood cells, white blood cells, and platelets, but it does not pertain to the movement of leukocytes out of capillaries.
- **Diapetesis**: This term specifically refers to the process by which leukocytes move through the walls of capillaries and into the surrounding tissues.

4. **Select the Correct Answer**: Based on the analysis, the correct term for the process of leukocytes squeezing out of blood capillaries is **C) Diapetesis**.

5. **Define the Process**: Diapetesis is characterized by leukocytes binding to endothelial cells and then squeezing through the gaps in the capillary walls to enter the interstitial fluid, which is crucial for immune responses.

### Final Answer:
The process by which leukocytes can squeeze out of blood capillaries is called **Diapetesis**.

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