primary defence immune system

Question 1

definition of primary defence

Answer 1

prevents pathogen from entering the body

Question 2

imflammatory response

Answer 2

release of histamine to promote swelling and causes white blood cells to accumulate in infected area to produce secondary immune response.

Question 3

how does stomach have primary defence?

Answer 3

hydrochloric acid kills pathogens

Question 4

nose primary defence mechanism

Answer 4

produce snot from mucus membrane traps pathogens, dust, bacteria preventing entry into airways

Question 5

how is crying a primary defence mechanism

Answer 5

lysosome secreted through tear glands - antibacterial washing pathogens out

Question 6

eyelashes as a primary defence

Answer 6

stops pathogens/dust entering eyes

Question 7

mucous membranes

Answer 7

goblet + epithelial cells - traps bacteria and wafts it out of airways (cilia)

Question 8

what is the most important primary defence

Answer 8

skin (produces sebum)

Question 9

how does the body prevent infection when you accidentally fall over and cut yourself

Answer 9

blood clotting + formation of scabs

Question 10

describe events of immflamation

Answer 10

• mast cells produce histamine
• vasodilation occurs
• blood increase to infected area
• capillary wall = increases permeability to WBC
• increase production of tissue fluid
• leads to swelling (odema)
• excess tissue fluid drained in lymphatic system (where lymphocytes are stored)
  = specific immune response