Final answer:
MHC I receptors bind to intracellular pathogens such as viruses and trigger an immune response that destroys the infected cell and the pathogen within.
Step-by-step explanation:
MHC I receptors bind to intracellular pathogens, particularly viruses. These receptors are found on the surface of all nucleated cells and are responsible for presenting foreign antigens from intracellular pathogens to cytotoxic T cells, triggering an immune response against the infected cell. This response leads to the destruction of the infected cell and the pathogen within.