part of the immune system that protects all of the body except for the central nervous system (which is protected by the neuroimmune system) one of two major divisions of the nervous system that consi...part of the immune system that protects all of the body except for the central nervous system (which is protected by the neuroimmune system) one of two major divisions of the nervous system that consists of all the nervous tissue that lies outside the central nervous system disease in which the alveoli of the lungs become inflamed and filled with fluid, usually as a result of infection, causing symptoms such as shortness of breath, coughing, chest pain, and fever
