defending against infection

Question 1

how many lines of defence does the body have?

Answer 1

3

Question 2

what is the first line of defence?

Answer 2

the skin

Question 3

how does the skin defend itself from microbes and pathogens?

Answer 3

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

Question 4

what is the second line of defence ?

Answer 4

platelets

Question 5

how do platelets defend against microbes?

Answer 5

. platelets clot the blood creating a scab keeping out microbes

Question 6

what is the 3rd line of defence ?

Answer 6

white blood cells

Question 7

what do phagocytes do?

Answer 7

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

Question 8

what do lymphocytes do?

Answer 8

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

Question 9

what do lymphocytes also do?

Answer 9

. produce antitoxins to counteract toxins produced by bacteria