Which cell type is NOT involved in the immune response?

Red blood cells are primarily responsible for transporting oxygen throughout the body and are not involved in the immune response. Their main function is to carry oxygen from the lungs to the tissues and facilitate the return of carbon dioxide from the tissues back to the lungs for exhalation. Unlike immune cells, red blood cells do not have the ability to recognize or respond to pathogens or other foreign substances in the body.

On the other hand, neutrophils, eosinophils, and basophils are all types of white blood cells (leukocytes) that play crucial roles in the immune response. Neutrophils are the first responders to sites of infection and are key in phagocytosing pathogens. Eosinophils are primarily involved in combating parasitic infections and also play a role in allergic reactions. Basophils release histamine and other mediators during inflammatory responses, contributing to the regulation of immune processes. Each of these immune cell types has specific functions that are critical for maintaining the body's defense against various pathogens.