Final answer:
Diapedesis is the movement of WBCs to areas of inflammation in response to chemical mediators. It is a crucial step in the immune response.
Step-by-step explanation:
The movement of white blood cells (WBCs) to areas of inflammation in response to chemical mediators is called diapedesis. Diapedesis refers to the process by which leukocytes squeeze through adjacent cells in a blood vessel wall to enter tissues. This process is essential for the immune response to pathogens and helps to recruit more leukocytes to the site of inflammation.