The tonsils are the lymphatic tissues located at the end of the nasal cavity, known as the oropharynx.
Explanation: The tonsils play a crucial role in the immune system by helping to defend the body against infections. They are positioned strategically at the entrance of the throat, allowing them to act as a first line of defense against pathogens that enter through the mouth or nose. The main types of tonsils include the palatine tonsils, pharyngeal tonsils (adenoids), and lingual tonsils, all contributing to the body’s lymphatic system.