defending against infection Flashcards

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1
Q

how many lines of defence does the body have?

A

3

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2
Q

what is the first line of defence?

A

the skin

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3
Q

how does the skin defend itself from microbes and pathogens?

A

. dead skin cells form barriers on the surfae
. microbes on the skin surface called skin flora make it hard for pathogens to become established

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4
Q

what is the second line of defence ?

A

platelets

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5
Q

how do platelets defend against microbes?

A

. platelets clot the blood creating a scab keeping out microbes

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6
Q

what is the 3rd line of defence ?

A

white blood cells

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7
Q

what do phagocytes do?

A

. recognise foreign body
. ingest foreign body
. digest foreign body

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8
Q

what do lymphocytes do?

A

. produce antibodies
.antibodies bind to the antigen
. antobodies destroy antigen

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9
Q

what do lymphocytes also do?

A

. produce antitoxins to counteract toxins produced by bacteria

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