HHB 3.5 Non-Specific Body Defences Flashcards

Front

Non-specific defence

Back

the body's first line of defence against infections, acting generally against a wide range of pathogens rather than targeting specific ones.

Front

Physical barrier

Back

helps to prevent pathogens entering the body

Front

Epithelial cells

Back

form a closely-packed physical barrier and are found in the skin and inner linings of the digestive and respiratory systems

Front

Pathogens

Back

disease causing organisms such as a bacterium, virus or other organism

Front

Chemical Secretions

Back

substances that are produced against invading pathogens e.g. tears, saliva, mucus and stomach acid

Front

Inflammatory response

Back

the body's response to injury or infection

Front

Mast cells

Back

produce Histamine

Front

Histamine

Back

released by mast cells causing

vasodilation and increased capillary

permeability.

The increased blood flow leads

to an accumulation of phagocytes and

clotting elements at the site of infection.

Front

Phagocyte

Back

cells that recognise pathogens and

destroy them by phagocytosis.

Front

Phagocytosis

Back

involves the engulfing of

pathogens and their destruction by digestive

enzymes contained in lysosomes.