What type of cells are referred to as APCs (Antigen Presenting Cells)?

• A. T cells and B cells
• B. Macrophages, dendritic cells, and B cells
• C. Neutrophils and eosinophils
• D. Cytotoxic T cells

Answer: (B)

Antigen Presenting Cells (APCs) play a crucial role in the immune response by capturing and presenting antigens to T cells, thus initiating a targeted immune response. The correct answer identifies macrophages, dendritic cells, and B cells as APCs.

Macrophages are effective at engulfing pathogens and processing antigens, presenting them on their surface in a form that T cells can recognize. Dendritic cells are the most efficient type of APC, known for their ability to activate naive T cells, and play a key role in bridging innate immunity and adaptive immunity. B cells, while primarily known for their role in producing antibodies, can also function as APCs by presenting antigens to helper T cells, which is vital for T cell activation and the subsequent antibody response.

This highlights the multifaceted roles that these cells play in the immune system, beyond their primary functions, as they help orchestrate the immune response through antigen recognition and presentation.