The system that is responsible for filtering out pathogens is:

The lymphatic system is primarily responsible for filtering out pathogens and plays a crucial role in the body's immune response. It includes lymph nodes, lymph vessels, and the spleen, all of which help trap and destroy harmful microorganisms such as bacteria and viruses. Lymph nodes act as filters, where lymph fluid passes through and immune cells can identify and respond to pathogens. The lymphatic system also produces lymphocytes, a type of white blood cell that is essential for the immune system's defense against infections.

Other bodily systems, such as the skeletal system, digestive system, and respiratory system, each have their functions but do not primarily focus on filtering pathogens. The skeletal system provides structure and support, the digestive system is mainly involved in nutrient absorption and waste elimination, and the respiratory system facilitates breathing and the exchange of gases. While they contribute to overall health, they do not play a direct role in the filtration and response to pathogens as effectively as the lymphatic system does.