Aids to Health
What is immunity?
Immunity is the body's ability to fight against foreign substance and pathogens by producing antibodies that can kill or neutralize these foreign substance. Our body has many ways to fight against these infection.
What are pathogens and How do they
attack our body?
Bacteria,viruses and many other microorganisms that may cause diseases are called pathogens.These pathogens may attack our body in several ways,such as:
- directly through the skin;
- through mucous membranes;
- through contaminated air,food and water.
Thankfully, our body has many defence mechanisms against these pathogens. There are a series of step called the immune response,which immune fights with microorganisms and substances the attack our body.
The defence system in our body works at two levels:1. local defence and 2. immune system.
Local defence system(skin,mucous secretions and WBCs)
The local defence system is a barrier system which prevents the entry of germs at their possible entry points in our body. It includes skin, mucous secretions and WBCs.
Immune system( Antibodies and Lymphocytes )
The immune system tackles the germs after they have entered the body. It includes action by antibodies, lymphocytes and immune response.
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