5.1- Types of Defence mechanisms Flashcards
What are the two responses involved within the non-specific defences?
- Phagocytosis
- Physical barriers such as skin and mucus.
What is the definition of immunity?
When the immune system can overcome the pathogen within the second and further infections.
What is the term used to refer to your own body cells?
Self- cells
What are example of non-self cells?
Pathogens, non-self material, toxins and abnormal body cells
Are lymphocytes produced or are they already there?
There is only a small amount of lymphocytes that target one type of pathogen, however, there are a range of different types .
What does clonal selection mean?
Where, after a pathogen has been identified, mitosis is stimulated within the lymphocytes in order to destroy the pathogen.
How to lymphocytes recognise which pathogen are non-self?
Due to the chemical barrier surrounding the pathogen.
What is apoptosis?
Where the lymphocytes that respond to self-antigens undergo a programmed cell death before they can mature.
