PHYSICAL AND CHEMICAL BARRIERS

  • Created by: sara.5
  • Created on: 22-04-18 12:36
What sort of barrier is the skin?
Physical
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How does the skin create a barrier?
Its thick over most parts of the body.Pathogen can usually only cross skin through wounds or animal vector that pierce skin
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What sort of Barrier is Lysozyme?
Chemical barrier
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How does the Lysozyme create a barrier?
Skin had additional defences because it contains glands that secrete substance on skin surface.These substance include Lysozyme
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What doe lysozyme do?
An enzyme that breaks down cell walls of some bacteria
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Where else can Lysozyme be excreted from?
Saliva ,tears, Saliva and mucus
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How is mucus a barrier?
Lysozyme secreted from mucus where it helps protect thinner surface area of body.Mucus is sticky secretion produced by cell linning many openings mouth and nose that could use to enter the body.Dust and pathogen get trapped in mucus
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How to ciliated cells prevent pathogen from entering the body?
They are specialised cells that move substance such as mucus across their surface.This helps to carry dust and pathogen away either out of the body or in the digestive system
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How does Hydrocloric acid prevent pathogens from entering the body?
Cell inning of the stomach secret this acid, reducing pH content of stomach to nearly 2.At this acidity many pathogens are destroyed.Only a few e.g Helcobacter Pyloin are adapted to survive
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What are some natural defences of the reproductive system?
Lysozyme in Vaginal fluid and mucus. But some pathogen can over come this
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How are these pathogen transmitted?
Through sexual activity
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What are examples of these sort of pathogen?
HIV, Chlmydia bacterium
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How do they spread?
Contact with sexual fluids
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How can this transmission be reduced?
By avoiding direct contact with sexual fluids e.g condom
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What can these pathogen pass on to?
Th baby
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How can HIV be passed?
From an infected to another through sharing needles when injecting blood
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What helps to identify an infection?
Screening
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Why is the blood given to people screened?
To make sure it it does not contain HIV particles or any other pathogen
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Other cards in this set

Card 2

Front

How does the skin create a barrier?

Back

Its thick over most parts of the body.Pathogen can usually only cross skin through wounds or animal vector that pierce skin

Card 3

Front

What sort of Barrier is Lysozyme?

Back

Preview of the front of card 3

Card 4

Front

How does the Lysozyme create a barrier?

Back

Preview of the front of card 4

Card 5

Front

What doe lysozyme do?

Back

Preview of the front of card 5
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