Non-Specific Defences

Question 1

Epithelial cells form a

Answer 1

physical barrier

Question 2

Epithelial cells can be found in

Answer 2

the skin and inner linings of the digestive and respiratory systems

Question 3

Chemical secretions are produced against

Answer 3

invading pathogens

Question 4

Examples of chemical secretions include

Answer 4

tears, mucus, saliva and stomach acid.

Question 5

In an inflammatory response, mast cells release

Answer 5

histamine

Question 6

Histamine causes

Answer 6

vasodilation and increased capillary permeability

Question 7

Increased blood flow in an inflammatory response leads to

Answer 7

a build up of phagocytes and clotting elements at the site of infection

Question 8

Phagocytes recognise pathogens and destroy them by

Answer 8

phagocytosis

Question 9

Phagocytosis involves the

Answer 9

engulfing of pathogens

Question 10

During phagocytosis, pathogens are destroyed by

Answer 10

digestive enzymes found in lysosomes.

Question 11

Phagocytes release cytokines which attract

Answer 11

more phagocytes to the site of infection

Question 12

Cytokines are protein molecules that cause

Answer 12

specific white blood cells to accumulate at the site of infection