What is the role of macrophages?

Macrophages play a crucial role in the immune system, primarily through their ability to engulf and digest pathogens, dead cells, and other debris in a process called phagocytosis. When macrophages encounter bacteria or other foreign particles, they can effectively capture and destroy them, thus helping to protect the body from infections. Their presence is vital in the body's defense mechanisms as they not only clear out harmful invaders but also play a role in alerting other immune cells by releasing signaling molecules (cytokines) that facilitate an immune response.

While antibodies are produced by B cells, blood clotting involves platelets and clotting factors, and blood pressure is regulated by the cardiovascular system and hormones, none of these functions are associated with macrophages. Instead, their primary function is centered around identifying and eliminating pathogens through their phagocytic activity.