What is the correct sequence of events that take place after a professional APC (macrophage or dendritic cell) encounters a pathogen? a. APC engulfs the Pathogen -> enzymes inside the APC breaks up the pathogen -> APC presents the antigen on the outside of its membrane -> helper T ceIl binds to the antigen with its receptor. b. APC engulfs the pathogen -> APC becomes infected -> APC goes through cell death. c. APC does not engulf the pathogen because it is only part of the specific immune response. d. APC engulfs the pathogen -> APC presents the antigen on the outside of its membrane -> NK ceIl kilIs the APC.

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Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.