Immune system Flashcards
What is the incubation period?
Pathogen multiplying period- days or weeks before the person feels ill
What is disease?
Any condition that impairs the normal state of an organism and usually changes the function of one or more of its organs or organ systems.
Some are caused by pathogens, which can attack and destroy cells or release toxins
What are your bodies physical defences against disease
SKIN acts as the main barrier physical barrier- if skin gets cut- SCAB forms
FINE HAIRS & MUCUS can trap pathogens before they can move deeper into the body
What are your bodies chemical defences against disease
Stomach acid is strong enough to kill any pathogens that have been caught in mucus in the airways or consumed in food or water
Body barriers (diagram)
Body barriers (words)
What are antigens?
Antigens are molecules on the outside of a pathogen that help white blood cells see that it is foreign
What happens if pathogens do make it inside your body?
2nd line of defence kicks in- the immune system kicks in to destroy them
What are the 3 lines of defence by white blood cells?
- Consume foreign cells- phagocytosis
- Release antitoxins to neutralise the poisons produced by microbes
3.Produce antibodies which lock onto invading cells so they can be found and destroyed
What’s happening in this picture?
What’s happening in this picture?
Phagocytosis
What’s happening in this picture?
Draw a diagram of phagocytosis