Our Immune System

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There are 2 types: -

- T-cells - B-cells

They produce antibodies.

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Antigens

all cells have surface markers called antigens.

body can recognise these as self or non-self (foreign)

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Specific response

Lymphocytes detect presence of foreign antigens

Stimulated to produce

specific proteins called

antibodies.

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antibodies combine with their specific antigen (like a lock and key)

this renders the pathogen harmless.

= primary response

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Immunity

= the bodies ability to resist infection

can be natural or acquired

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Immunological memory

after an infection is fought off some lymphocytes become memory cells.

if same pathogen returns memory cells stimulate the produce the specific antibody very rapidly.

the infection is fought off before symptoms appear = secondary response

vaccines can stimulate same response

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Immune system

Can you

Outline the stages in phagocytosis.

Describe how antibodies work and how they are specific.