6.1 Defence Mechanisms Flashcards
- What are the main defence mechanisms in the body? - How does the body distinguish between its own cells and foreign cells?
1
Q
What are the two main types of defence mechanisms?
A
Non-specific mechanisms
Specific mechanisms
2
Q
How do non-specific mechanisms work?
A
They do not distinguish between one type of pathogen and another, but respond to all of them in the same way.
3
Q
What two forms do non-specific mechanisms take?
A
A barrier to the entry of pathogens
Phagocytosis
4
Q
How do specific mechanisms work?
A
They involve lymphocyte cells and provide long-lasting immunity.
5
Q
What two forms do specific mechanisms take?
A
Cell-mediated responses involving T lymphocytes
Humoral responses involving B lymphocytes
6
Q
Why do lymphocytes not destroy the body’s cells?
A
Because they are not complementary to the cells. They are specific to a pathogen and a pathogen only.
