Given below are some human organs. Identify one primary and one secondary lymphoid organ. Explain its role.

How does saliva act inbody defence?

How does immune system work?

Name and explain the type of barriers which involve macrophages.

What are interferons? Mention their role.

List out chemical alarm signals produced during inflammation.

What are helper T cells?

What are killer cells?

What are haptens?

Mention the functions of immunoglobulins?

Name the factors which serve as binding force of antigen antibody reaction.

Define a vaccine.

What is western blot test?

What is contact inhibition?

Name the primary lymphoid organs?