Anatomy and Physiology II Practice Test

Lymph nodes play several crucial roles within the lymphatic system, including defense against pathogens, filtering lymph fluid, and facilitating the production and activation of immune cells, primarily lymphocytes, which are a type of white blood cell.

The primary function of lymph nodes involves defense, where they act as sites for the immune response, trapping pathogens and foreign particles. They also filter lymph, ensuring that harmful substances are removed before the lymph returns to the bloodstream. Additionally, lymph nodes are involved in the production of lymphocytes, which are essential for the body's immune defense.

Erythropoiesis, or the formation of red blood cells, occurs mainly in the bone marrow and is not a function associated with lymph nodes. This process is distinct and separate from the activities of the lymphatic system. Thus, identifying erythropoiesis as not being a function of lymph nodes accurately reflects the specific roles these structures play in the body's immune system.