Relier Pairs 1.22 Inmune system concepts (D)Version en ligne Some inmune system concepts par Jorge Arizpe 1 Pathogens that live outside the cells. 2 They are the first barrier 3 These are part of the second barrier 4 We are born with this type of inmunologycal defense. 5 Any external biological agent that can harm the host 6 We acquired this type of inmunologycal defense along aour lives. 7 Sustancia que al introducirse en el organismo induce en este una respuesta inmunitaria, provocando la formación de anticuerpos. 8 These are part of the Third barrier 9 This are pathogens that need to live inside a cell.