What is the function of eosinophils?

Eosinophils, as an important type of white blood cell in the human body, have functions mainly reflected in the following aspects: 1. **Anti-parasitic infection:** Eosinophils can secrete various proteases and cytotoxic substances to kill parasites, thus playing a key role in resisting parasitic infections. 2. **Participation in allergic reactions:** During allergic reactions, eosinophil counts usually increase. By releasing inflammatory mediators and other mechanisms, they participate in and amplify allergic responses. 3. **Phagocytosis of bacteria and parasites:** They contain numerous eosinophilic granules capable of engulfing foreign substances such as invading bacteria and parasites, thereby protecting the body from external threats. 4. **Regulation of immune responses:** Changes in eosinophil counts reflect the intensity of the body's immune response to different stimuli, making them an important component of the immune system.