The bodily system that protect the body from foreign substances, cells, and tissues by producing the immune response.

2. Introduction:
The bodily system that protect the body from foreign substances, cells,
and tissues by producing the immune response.

3. Components of immune system
• The immune system is made up of antibodies, white blood
cells, and other chemicals and proteins that attack and destroy
substances such as bacteria and viruses.
• The lymphatic system is an important part of the immune
system.

4. Antigen or immunogen:
• Is a foreign substance often a protein which stimulates the
formation of antibodies
Antibodies :
• Are specific i.e. cause the destruction of the antigen which stimulate
their production

5. Types of immunity:
Two types of immunity
1.Active immunity
2.Passive immunity

6. Active immunity:
• The use of vaccines which stimulate the production of antibodies
in the body and making a person immune against the disease or
infection, is called active immunity
Passive immunity:
• Antibodies are injected in the form of antisera, to make a person
immune against a disease this is called passive immunity.