Final answer:
Mast cells and dendritic cells are tissue-bound cells that are important in the early stages of immune responses at the site of infection. Mast cells produce histamines, while dendritic cells are specialized in antigen presentation to T cells.
Step-by-step explanation:
Mast cells and dendritic cells are tissue-bound cells that are important in the early stages of immune responses at the site of infection. Their main function is to recognize and respond to pathogens by releasing mediators that initiate and modulate the immune response.
Mast cells produce histamines, which are inflammatory molecules released in type I hypersensitivities. On the other hand, dendritic cells are involved in antigen presentation to T cells, which is essential for initiating and regulating the adaptive immune response.