Final answer:
Chemokines regulate the chemotactic activity of leukocytes by attracting them to sites of infection, tissue damage, and inflammation.
Step-by-step explanation:
The chemotactic activity of leukocytes is mainly regulated by chemokines. Chemokines are chemotactic factors that specifically recruit leukocytes to sites of infection, tissue damage, and inflammation. They work by attracting leukocytes to the site through chemotaxis, which is the directional movement of cells in response to a chemical attractant.
Learn more about Chemokines