Final answer:
T cells exit the lymph node through the efferent lymphatics after not being activated by dendritic cells within the node.
Step-by-step explanation:
T cells that have not been activated in the lymph node (via dendritic cells) exit the lymph node through the efferent lymphatics. The lymph node, a critical part of the immune system, filters the lymph fluid that enters through the afferent lymphatic vessels. After the lymph fluid has been filtered and immune cells such as T cells have interacted with presenting cells like dendritic cells, it leaves the lymph node via the efferent lymphatic vessels.