Final answer:
Lymph node clusters are found in the armpits, among other locations, and are integral to the immune system's function, containing cells that fight infections.
Step-by-step explanation:
Lymph node clusters would be found in the armpits. Lymph nodes are small, organized collections of lymphoid tissue that are located at intervals along the lymphatic vessels. These nodes play a vital role in the body's immune response by filtering lymph, which is a fluid containing immune system cells. In humans, lymph nodes are commonly found in several regions including the groin, neck, chest, and abdomen, as well as the armpits. They contain lymphocytes such as B cells and T cells, which are crucial for the immune system to fight off infections.
Lymph nodes act as major staging areas where immune responses are developed, with about 500-600 lymph nodes distributed throughout the body.