How do infection fighting cells move around the body to get to the infected area?

Infection-fighting cells, primarily leukocytes, move through the body via the bloodstream and lymphatic system. When an infection occurs, chemical signals from damaged tissues and pathogens attract these cells to the site of infection in a process called chemotaxis. They exit the bloodstream by squeezing through the walls of blood vessels, a process known as diapedesis, allowing them to reach and combat the infection effectively.