Micro-organisms Flashcards
(19 cards)
Immunity
The ability to resist infection
A pathogen
An organism that causes disease
The general defence system
Acts a barrier to all pathogens attempting to gain entry to the human body
The specific defence system
Attacks particular pathogens
An antigen
Is a foreign molecule that stimulates the production of antibodies
An antibody
Is a protein produced by white blood cells in response to an antigen
Induced immunity
The ability to resist disease caused by specific pathogens by the production of antibodies
Active immunity
involves the production of a persons own antibodies in response to antigens that enter the body
Natural active immunity
Occurs when a pathogen enters the body in a normal way
Artificial active immunity
occurs when a pathogen is medically introduced to the body
A vaccine
Is a non disease causing does of a pathogen which triggers the production of antibodies
Passive immunity
Occurs when individuals are given antibodies that were formed by another organism
Natural passive immunity
occurs when a child gets antibodies from its mother
Artificial passive immunity
Occurs when a person is given an injection containing antibodies made by another organism
B-cells
Produce antibodies
Helper t-cells
Recognise antibodies and stimulate the production of b-cells
Killer t-cells
Release a protein perforin which form pores in the membrane of the abnormal cell. Water and ions flow into the cell and cause it to burst
Suppressor t-cells
Inhibit b-cells t-cells and macrophages
Memory t-cells
Stimulate memory b-cells to produce antibodies
