immunity

vaccinations: a small dosage of a disease is inserted into the body so that lymphocytes can be produced and clump together pathogens (lock and key) . then phagocytosis can take place before the disease spreads, so that if you got the disease, the immune system would destroy it before you even feel any symptoms
Herd immunity: when a certain amount of people have a vaccination against a disease, this can prevent others from getting that disease who may not be able to get vaccinated because of age, illness or allergies. It is a 'protective barrier' which discontinues the spread of a disease. Each disease has an Ro=basic reproduction number.

non-specific defence mechanisms

These are parts of the body that act as barriers to prevent pathogens from entering our body. some include:
nose hairs(mucus)
mucus and ciliated cells on bronchi and trachea
skin (barrier)
tears(enzymes that 'kill' pathogens)
stomach (acid that kills enzymes)

Specific Defence Mechanisms

	Creado por Millie Balcombe hace alrededor de 5 años

GCSE Biology Diapositivas sobre Biology KA1, creado por Millie Balcombe el 03/11/2019.