Immunology and public health Flashcards Preview

Unit 4 Biology > Immunology and public health > Flashcards

Flashcards in Immunology and public health Deck (14)
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1

What types can non specific defences be?

Physical and chemical

2

What do epithelial cells do?

Form a physical barrier

3

Where are epithelial cells found?

In the skin and inner linings of the digestive and respiratory systems

4

Why are chemical secretions produced?

To prevent invading pathogens

5

Give examples of areas of secretions

Tears, saliva and stomach acid

6

What is a pathogen?

A bacterium, virus or other organism

7

What can a pathogen cause?

A disease

8

Describe the inflammatory response

Histamine is released by mast cells causing vasodilation and increased capillary permeability
Increased blood flow leads to an accumulation of phagocytes and clotting elements at the site of infection

9

What do phagocytes do?

They recognise pathogens and destroy them by phagocytosis

10

What does phagocytosis involve?

engulfing of pathogens and their destruction by digestive enzymes contained in lysosomes

11

What do phagocytes release?

Cytokines

12

What does cytokines attract?

More phagocytes to the site of infection

13

What are cytokines?

Protein molecules

14

What do cytokines act as?

A signal to specific white blood cells causing them to accumulate at the site of infection