Immune System | Summary

https://sciencewithsusanna.com has diagrams, notes, and practice questions. Quizlet Review: https://quizlet.com/_6jggx7 The immune system has two main branches: the innate immune response and the adaptive immune response. The innate immune response includes cells and mechanisms that are able to react to pathogens from birth. The adaptive immune system can learn and remember new pathogens and then protect from them long-term. The innate immune system is composed of: 1. physical barriers such as mucous membranes and skin 2. chemical barriers such as lysozyme and stomach acid. 3. Complement is a group of small circulating chemicals that, when triggered, form a "membrane attack complex" that can punch holes in pathogen cell membranes. The leukocytes that are involved in this response include: *Granulocytes - neutrophils, basophils, eosinophils *Agranulocytes - macrophages and dendritic cells, which can be phagocytic and present antigens from invaders to the adaptive immune response cell