Final answer:
The adenoids and tonsils are lymphoid tissues that trap and help destroy pathogens to protect the body from infections, mainly functioning in children to develop immunity.
Step-by-step explanation:
The adenoids and tonsils serve a crucial role in the immune system by defending the body against infections. They are lymphoid tissues that are positioned in the throat and nasal cavity. The tonsils are found on either side of the throat and help trap pathogens from food or air that enters through the mouth and nose. The adenoids are located in the back of the nasal cavity and also trap pathogens, aiding in the immune response. Both tonsils and adenoids contain lymphocytes which help destroy the trapped pathogens, playing an active role in the body's defense against illness. While they are more prominent in children and serve to develop immunity, they can sometimes cause issues such as recurring infections, leading to their surgical removal.