Answer: Marcophages
Bacterial cells may be phagocytized by certain types of immune cells, such as neutrophils and macrophages. Phagocytosis is the process by which immune cells engulf and internalize foreign particles or pathogens, including bacteria.
Once a bacterial cell has been phagocytized, it is processed by the immune cell in order to present pieces of the bacteria, called antigens, on the surface of the cell. This process is known as antigen presentation. Antigen presentation allows the immune system to recognize the bacterial cell as foreign and to mount a specific immune response against it.
The immune cell uses proteins called major histocompatibility complex (MHC) molecules to present the antigens on its surface. There are two types of MHC molecules: MHC class I and MHC class II. MHC class I molecules present antigens to T cells, which are a type of immune cell that plays a key role in cell-mediated immunity. MHC class II molecules present antigens to B cells, which are a type of immune cell that produces antibodies as part of the immune response.
Antigen presentation is an important part of the immune response to bacterial infections. It helps the immune system to identify and target specific pathogens, and to mount an appropriate immune response to eliminate them.