immune system
how the immune system works
1st and 2nd line defenses
1st line: dead skin barrier, mucus, saliva, tears contain lysozyme (enzyme that breaks down bacterial cell walls), acidic oil and sweat kills many bacteria
2nd line: inflammatory response, increased white blood cell production, blood vessel expansion, infectedtissue becomes swollen, painful, fever (heat kills pathogens)
recognizing the pathogen
innate immunity- a subsystem of the overall immune system that comprises the cells and mechanisms that defend the host from infection by other organisms. antigens will be produced when a recognized pathogen invades.
pathogen
broadest sense of anything that can produce disease
antigen
abbreviation of antibody generator, is any substance which serves as a target for the receptors of an adaptive immune response.
antibody
An antibody (, also known as an immunoglobulin , is a large Y-shape protein produced by plasma cells that is used by the immune system to identify and neutralize foreign objects such as bacteria and viruses.
immune response
the body is attempting to fight invading pathogens by swelling infected tissue, expanding blood vessels, fever.
phagocyte
Phagocytes are cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells.