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defence system


What is pathogen? Organism that cause diseases
What is immunity? The ability to resist infection
What is general system? Is non-specific. This means that it acts against all pathogens.
What is specific defence system? Is also called the immune system. It attacks particular(or specific) pathogens
First line of general defence Skin,Clotting,Lysozyme,Sebaceous Glands, Mucous, Cilia, Acid and Beneficial Bacteria
S: Physical barriesr SKIN
C:The skin is broken, blood ... prevents the entry of further pathogens CLOTTHING
L: This is an enzyme found in sweat, tears and saliva. It attacks and dissolves the cell walls of many bacteria LYSOZYMES
S.G:Produce chemicals that kill bacteria SEBACEOUS GLANDS
C:Theses beat and create current, which moves mucous back up the respiratory system so that it can be swallowed into stomach CILIA
A:Hydrochloric... in the stomach kills many pathogens ACID
B.B: In the vagina produce lactic acid. This acid prevent the growth of pathogens BENEFICIAL BACTERIA
Second line of general defence Destruction of pathogens by white blood cells, production proteins kill or prevent pathogens from reproducing
Types second line of general defence White blood cells Defence proteins Inflamation
White blood cells Micro-organisms they realease number of chemicals. Destroy any bacteria, viruses or other micro-organisms that they meet
Types of white blood cells Phagocytes and magrophages
Phagocytes Sunrround and ingest pathogens
Magrophages Phagocytes very large, move around the body in body fluids and act as scavengers for pathogens
Defence proteins 20 proteins found in the blood plasma. The proteins in complement are activated by infection, and they destroy viruses and other pathogens. Multiplication and help to limit
Specific defence system Attacks particular(or specific) pathogens
Types of specific defence system Lymphocytes and monocytes Antigens and antibodies Active immunity
Monocytes Recognise foreign molecules, digest a pathogen, antigens. These antigens then stimulate the production of antibodies
Created by: ppsaura



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