the immune system Flashcards Preview

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Flashcards in the immune system Deck (12):
1

what happens when pathogens overcome all physical and chemical barriers?

immune system becomes active and attack pathogens

2

what are the molecules called on the outer surfaces of cells and virus particles?

antigens

3

what does the immune system antigens for?

to identify if something inside the body is a cell of the body or has come from outside (foreign)

4

give an example of white blood cells

lymphocytes

5

what molecules do lymphocytes have on their surfaces?

antibodies

6

what do antibodies do?

match the shape of antigens on the pathogen

stops pathogen from working

7

what happens to lymphocytes after they have matched the pathogens antigens?

it becomes activated and divides rapidly to produce identical lymphocytes with the same antibodies

these then spread to other parts of immune system destroying other matched pathogens

8

when all the pathogens have been killed , some lymphocytes with antibodies that match that pathogen's antigens remain in the blood. what are they called?

memory lymphocytes

9

how will your body react if that pathogen attacks again?

memory lymphocytes mean that a much faster secondary response will happen that will stop you getting ill

YOU ARE IMMUNE TO THAT PARTICULAR PATHOGEN

10

name an artificial way to become immune to a pathogen

a vaccine

11

what does a vaccine contain?

weakened or inactive pathogens

bits of pathogen that include the antigens

12

how do you administrate a vaccine?

by injection or mouth