SC214 Lecture Notes - Lecture 8: Natural Killer Cell, Breast Milk, Urethra
11 Nov 2018
School
Department
Course
Professor
Document Summary
Bodily fluids of infected person gets into the mucous membranes of another person. Dead skin is constantly being shed and replaced. It has an acidic ph which is hostile to microorganisms. Hair covers membranes, preventing the disease from entering the mucous membrane. Secretions (like snot) or fluids (like vomit) remove microorganisms from our body. Digest and destroy bacteria and some fungi. Engulf and digest foreign cells (viruses and bacteria parasites) Natural killer cells and clean up dead cells. Target tumors and cells infected by viruses. Release chemicals that disintegrate cell membranes of tumor cells and virus-infected cells. Specific and adaptive immune response (3rd line of defense) Recognizes and targets specific pathogens or foreign substances. It has a memory -the capability to store information from past exposures so that it can respond more quickly to later invasions by the same pathogen. It protects the entire body; the resulting immunity is not limited to the site of infection.
