Immunology a. What are the 4 categories of pathogens? What kinds of things (targets) on those pathogens can the immune system detect? b. What do you think would happen to animals that are deficient in pathogen recognition receptors? c. What are some of the hallmarks of early inflammation? Describe the physical and chemical characteristics of an inflammatory response. d. What happens later in the acute phase response of inflammation? e. Why is inflammation critical to immune responses? f. What are some ways that pathogens evade the innate immune system? g. How is the Classical complement pathway triggered? h. How is the Lectin complement pathway triggered? i. What are the 3 ways the Alternative complement pathway can be triggered?.