What is formed in response to diseases caused by infectious agents?

The immune system is specifically designed to respond to diseases caused by infectious agents, such as bacteria, viruses, fungi, and parasites. It consists of various cells, tissues, and organs that work together to identify and eradicate these pathogens. When the body detects an infection, it activates the immune response, which may include the production of antibodies, the activation of T cells, and the release of signaling molecules called cytokines.

This response is critical for protecting the body and maintaining health, as it helps to fight off infections and prevents the spread of disease. The immune system is capable of remembering past infections, allowing for a more rapid and effective response upon subsequent exposures to the same infectious agent.

Other systems like red blood cells, the nervous system, and the circulatory system play important roles in the body, but they do not have the specialized function of combating infectious diseases. For instance, red blood cells are primarily involved in oxygen transport, the nervous system coordinates bodily functions and processes sensory information, and the circulatory system facilitates blood flow throughout the body. None of these systems are tasked with the direct response to infectious agents as effectively as the immune system.