Final answer:
Macrophages exhibit several key functions but do not display a lack of migration from sites of infection to secondary lymphoid organs; instead, they do migrate to these areas to assist in immune responses.
Step-by-step explanation:
Macrophages exhibit numerous functions as a critical component of the immune system. However, one characteristic that macrosages do not exhibit is: they don't migrate from sites of infection to nearby secondary lymphoid organs. The correct characteristics that macrophages display include:
- They trap and degrade pathogens in secondary lymphoid organs.
- They deliver co-stimulatory signals to naive T cells needed for T-cell priming.
- Their ability to migrate from sites of infection to secondary lymphoid organs.
- They remove and degrade apoptotic lymphocytes from secondary lymphoid tissues.
Macrophages, which differentiate from monocytes, are central to both the innate and adaptive immune responses. They participate in phagocytosis, engulfing and degrading pathogens and cellular debris, and can present antigens to T cells to mount an immune response.