What is the key function of eosinophils in the immune system?

Eosinophils play a significant role in the immune system, particularly in the defense against large pathogens, such as parasitic infections. The key function of eosinophils is to target these large pathogens through a process known as degranulation. During degranulation, eosinophils release cytotoxic granules that contain proteins and enzymes capable of damaging or destroying the membranes of parasites, thereby contributing effectively to the immune response.

This process is especially important for combating helminths (parasitic worms) and other larger invaders that are too large to be phagocytized completely by other immune cells. By releasing their granules, eosinophils can also influence inflammation and modulate the activity of other immune cells, further enhancing the body’s response to infection.

The other options presented do not accurately describe the primary role of eosinophils. Antibody production is primarily the function of B cells, antigen presentation is carried out by specialized cells like dendritic cells and macrophages, and while macrophages are important for activating other immune responses, it is not the primary function of eosinophils.