Human Defence System Flashcards Preview

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Flashcards in Human Defence System Deck (20):
1

Pathogen

an organism that causes disease

2

Immunity

the ability to resist infection

3

General Defence System

acts as a barrier to all pathogens attempting to gain ENTRY into the human body.

4

Specific Defence System

attacks specific pathogens

5

Plasma B-cells

produces antibodies to a specific antigen

6

Helper T-cells

stimulate B-cells and Killer T-cells

7

Killer T-cells

attack and destroy abnormal (viruses, cancer) human body cells

8

Suppressor T-cells

inhibit immune response

9

Memory T-cells

survive for many years after infection is eliminated and can stimulate T-cells and B-cells if same infection enters again.

10

Antigen

a foreign molecule that stimulates the production of anti-bodies

11

Antibody

a protein produced by white blood cells in response to a specific antigen.

12

Vaccination

the administration (usually by injection) of a non-disease causing dose of a pathogen (or its toxin) to stimulate the production of antibodies.

13

Immunisation

is what occurs when we produce or are injected with antibodies against a pathogen.

14

Induced Immunity

the ability to resist a disease caused by specific pathogens by the production of antibodies.

15

Active Immunity

involves the production of a persons own antibodies in response to foreign antigens that enter the body.

16

Artificial Active Immunity

when a pathogen is medically introduced into the body.
eg. vaccinations

17

Natural Active Immunity

when a pathogen enters the body in a normal way.
eg. chicken pox

18

Passive Immunity

when individuals are given antibodies that were formed in another organism

19

Natural Passive Immunity

when a child gets antibodies from its mother.
-placenta
-breastfeeding

20

Artificial Passive Immunity

when a person is given an injection containing antibodies made by another organism.