Human defence responses

Skin defences:

• Barrier prevents pathogens reaching skin beneath

• Anti microbial secretions

• Microorganisms to stop pathogens growing by taking up materials and space

Nose defences:

• Hairs and Mucus to trap particles which may contain pathogens

Trachea and bronchi defence:

• Secret mucus to cath air containing pathogens

• Linings are covered in cilia that sweep mucus up to be swallowed

Digestive system defence:

• Stomach acid kills pathogens

• Vomiting / diarrhoea rid body of pathogens

Phagosite warriors fight with phagosytus:

Attack the bacteria/virus by engulfing and then investing them

Lymphocytes fight pathogens by

Producing unique antibodies for pathogens and the antigen on their surface

Once antibodies have been produced,

They can beaded very quickly if needed again

Some white blood cells produce antitoxing, which

Can counteract toxins released by pathogens

When i’ll, your body produces more

White blood cells

Memory cells

• White blood cells that have produced antibodies and served their purpose.

• Last up to 10 years

• Can recognise pathogens

Memory cells can fight off pathogens

Sooner, quicker, and in higher concentration