Biology B3-Science mini test

Created by: Tuta Akad
Created on: 22-04-17 17:00

what are pathogens and how can they spread?

Pathogens are microorganisms that cause infections(communicable) diseases. They can be spread by: -direct contact -water or air - vectors(spread diseases but dont catch them itself E.g: Mosquito-Malaria

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Spread of infectious diseases can be reduced by...

-Simple hygiene measures -destroying vectors -isolation -vaccination

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how many defences are there and name them

1)external -physical barriers:mucus,tears,hairs and skin. Another line of defence healing wounds (forming scabs:platelets and fibrin) and the nose 2)Internal- HCl acid in stomach so when digested microbes get killed,Immune system

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Explain immune system

The immune system is a system that protects the body.The white blood cells attack and destroy the pathagon.There are 2 types of WBC 1-Phagocytes:ingest pathagon 2- Lymphocytes:produce antibodies which clump antigens+produce antitoxins netrualise

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why are viruses hard to destroy?

becasue

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Other cards in this set

Card 2

Front

Spread of infectious diseases can be reduced by...

Back

-Simple hygiene measures -destroying vectors -isolation -vaccination

Card 3

Front

how many defences are there and name them

Back

Card 4

Front

Explain immune system

Back

Card 5

Front

why are viruses hard to destroy?

Back

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Biology B3-Science mini test