Which type of white blood cell is primarily involved in the response to bacterial infections?

Neutrophils are the white blood cells primarily involved in the response to bacterial infections because they are the first responders to sites of infection or inflammation. They are a type of granulocyte and play a crucial role in the innate immune response. Once they are recruited to the site of infection, neutrophils engulf and digest bacteria through a process called phagocytosis. They also release enzymes and antimicrobial substances stored in their granules, which helps to kill and digest pathogens.

Neutrophils are abundant in the bloodstream, accounting for about 55-70% of all white blood cells, which allows for rapid mobilization to infected tissues. Their ability to quickly respond to a wide variety of bacterial pathogens makes them vital for controlling acute infections and protecting the body from harm. This efficiency in targeting and eliminating bacteria positions neutrophils as a key player in the body's defense against bacterial infections.