8.1 immune system

Question 1

First line of defence

Answer 1

Designed to prevent entry of the pathogen into the body. Skin, Tears, Saliva, stomach acid, mucus

Question 2

Second line of defence

Answer 2

-Uses nonspecific responses
fever: heats the body to weaken or kill the pathogen

inflammation: Blood stream directs more white blood cells to the effected area to kill the pathogen

phagocytosis: sends phagocytes to engult and kill the pathogens.

Question 3

The third line of defense

Answer 3

• Takes a few days to react
• Sends B cells to identify and mark the pathogen
• B cells create antibodies with a matching marker
• Once the antibody binds with the pathogens, B cells release millions of antibodies to help fight off the pathogens
  -After the pathogen is defeated the B cells remain in the blood which creates memory cells
  -Immune to future attacks of the same pathogen

Question 4

Vaccination

Answer 4

-Vaccines are made of dead/inactive pathogens.
-The pathogens trigger the 3rd line of defense and build memory without making us dangerously sick.