Which of the following events will involve leucocytes fighting the pathogenic microorganism once a dental nurse has been exposed to them?

The inflammatory response mechanism is correct because it specifically encompasses the body's immediate reaction to injury or infection, during which leucocytes (white blood cells) play a crucial role. When a dental nurse is exposed to pathogenic microorganisms, the body reacts by signaling the immune system to send leucocytes to the site of exposure. These white blood cells are essential for combating pathogens, as they can directly attack and neutralize harmful microorganisms, as well as release substances that attract more immune cells to the area.

While the immune response mechanism also involves leucocytes in defending against pathogens, it encompasses a broader range of processes, including both innate and adaptive immunity. The inflammatory response is part of this immune response but is more specifically focused on the immediate reaction and the activities of leucocytes at the infection site.

Intact skin and mucous membranes serve as the first line of defense against pathogens, providing a barrier to prevent infection. They do not involve the action of leucocytes directly, as they function primarily as a physical barrier.

Personal protective equipment is crucial for dental professionals to prevent exposure to pathogens but does not involve leucocytes or the immune reaction itself; rather, it is a preventative measure to reduce the risk of infection.