Final answer:
True, neutrophils increase in response to bacterial infections; they are phagocytes that play a key role in the immune system by fighting off pathogens, particularly bacteria, and are an indicator of infection when present in high counts.
Step-by-step explanation:
True, neutrophils are increased in response to bacterial infections. These white blood cells act as rapid responders and efficient phagocytes, with their main function being to engulf and digest bacteria and other pathogens. Their granules contain lysozyme, an enzyme that breaks down bacterial cell walls, and defensins, which puncture the plasma membranes of bacteria and fungi leading to the death of these pathogens. High counts of neutrophils often indicate the presence of an infection, particularly ones caused by bacterial agents. This response is part of the body's nonspecific defense mechanism and plays a crucial role in the immune system's ability to fight off infections.
Furthermore, in the presence of an infection, substances like leukotrienes help attract neutrophils to the infection site. Neutrophils, alongside other immune cells like macrophages, work in concert to eliminate pathogens and clean up the site post-infection. These cells are an integral part of both the innate and adaptive immune responses, ensuring that infections are dealt with effectively.