Final answer:
The tissue not part of the immune response is the pancreas. The immune system consists of the thymus, spleen, and lymph nodes which are involved in immune functions, unlike the pancreas which is focused on digestive enzymes and blood sugar regulation.
Step-by-step explanation:
All of the following tissues are part of the immune response EXCEPT the: D. pancreas.
The immune system includes several components that are integral to its function, such as lymph organs like the thymus, spleen, and lymph nodes, which are all involved in the production, maturation, and deployment of lymphocytes that are critical for immune responses. However, the pancreas is not directly involved in the immune response. Its primary functions revolve around the production of digestive enzymes and regulation of blood sugar levels through the secretion of insulin and glucagon.
The thymus is a primary lymphatic organ where T cells mature. The spleen and lymph nodes are secondary lymphatic organs. These secondary organs are crucial in the adaptive immune response, where they filter lymph and blood, capture pathogens, and activate lymphocytes. In contrast, the pancreas has no direct role in the adaptive or innate immune responses.