37 Human Defence System Flashcards
What is a pathogen
A pathogen is a foreign body or cell (organism) that causes disease
What is immunity
Immunity is the ability to resist infection
What are the two parts of the human defence system
The general defence system
The specific defence system
Whats involved in the first line of general defence
1.Skin
2.Clotting
3.Lysozyme
4.Sebaceous glands
5.Mucus
6.Cilia
7.Acid
8.Beneficial bacteria
Whats involved in the second line of general defence
WBCS destroy pathogens
Pathogen killing proteins produced
What are macrophages
Vary large phagocytes
What are phagocytic WBCs
WBCs that engulf and destroy any pathogens they meet
What are rhe two different defence proteins
Complement
Interferons
Describe Complement Defence Proteins
Coplement is a set of abt 20 protein found in blood plasma.
Theyre activated by infection
They punch holes in pathogens causing them to swell and bust
Describe Interferons defence proteins
Prevent viral multiplication and help limit spread of virus infections
What is inflammation
When cells are infected they release a chemical called histamine that causes swelling rednesss pain.,
In addition it brings more WBCs to the area to figjt the infevtion
What is the specific defence system
The specific defence system acts against one type of pathogen or antigen
What is an antigen
A foreign substance that stimulates the production of antibodies
What is an antibbody
Protein produced by WBCs in response to an antigen
Where are antigens found
On the surface of pathogens such as viruses or bacteria
