BIO 121 Chapter Notes - Chapter 43: Natural Killer Cell, Mucous Membrane, B Cell
Document Summary
Innate | nonspecific, generalized response to various invaders. Immune system: adaptive | highly specific immune response that targets specific pathogens, foreign cells, malignant cells. Mucous membranes of digestive, respiratory, urinary, reproductive tracts: traps microbes and foreign particles expelled by ciliary action. Internal defenses: nonspecific phagocytes | specialized white blood cells; engulf foreign and infected cells. Neutrophils, macrophages: natural killer (nk) cells | trigger infected cells to commit apoptosis, blood proteins | released by infected cells to activate defense mechanisms in other cells. Interferons: complement proteins | lyse microorganisms, aid in phagocytosis. Inflammatory response | increases blood vessel permeability (allows for entry of fluid, phagocytes, repair cells into injured/infected area: fever (bodywide innate response) | inhibits microbial reproduction, quickens repair by increasing body temp. Adaptive immune response (slow) = individualized defense against particular pathogens/invaders. Remembers pathogens to destroy them more efficiently and quickly if they reappear. Long-term, lifetime developed in response to disease, pathogen exposure: ex.
