3.5 Non specific Body Defences Flashcards
(10 cards)
1
Q
Name two physical barriers
A
Epithelial cells
Chemical secretions
2
Q
Where are Epithelial cells found?
A
in the skin and inner linings of the digestive and respiratory systems.
3
Q
What are produced agaisnt invading pathogens?
A
Chemical secretions
4
Q
What do secretions include?
A
tears, saliva, mucus and stomach acid.
5
Q
What is a pathogen?
A
a bacterium, virus or other organism that can cause disease.
6
Q
Describe the 3 stages of the Imflammatory response.
A
- After injury Mast cells become activated and release histamine.
- Histamine causes blood vessels to Vasodilate and increased permeability.
- The increased blood flow leads to an accumulation of phagocytes and clotting elements at the site of infection.
7
Q
What are Cytokines?
A
are protein molecules that act as a signal to specific white blood cells causing them to accumulate at the site of infection.
8
Q
What do Phagocytes release?
A
Cytokines
9
Q
Describe Phagocytosis
A
Engulfs and destroys pathogens by digestive enzymes contained in lysosomes.
10
Q
A
