Highlight the Role of Thymus as a Lymphoid Organ. - Biology


Highlight the role of thymus as a lymphoid organ.



The thymus is one the primary lymphoid organ of the immune system. Maturation of lymphocytes occurs in the thymus. T-cells produced in the bone marrow get matured in the thymus and are released from here.

Concept: Immunity
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2011-2012 (March) Delhi Set 1

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It is generally observed that the children who had suffered from chicken – pox in their childhood may not contract the same disease in their adulthood. Explain giving reasons the basics of such immunity in an individual. Name this kind of immunity.

State the cause of adenosine deaminase enzyme deficiency.

Name any two types of cells that act as 'cellular barriers' to provide innate immunity in humans.

Name the primary and secondary lymphoid organs

Differentiate the following and give examples of Active and passive immunity

Describe the antigen-antibody complex

Suggest a method to ensure an anamnestic response in humans.

What are interferons?

In the following questions/statements has four suggested answers. Rewrite the correct answer

An antiviral protein released from infected and dying cells is:

(A) Antigen

(B) Antibody

(C) Antiserum

(D) Interferon

Expand the following: SCID

''Abnormally, large numbers of WBCs in the blood are usually an indication of some infection in our body''. Comment on the statement.

Name the following:

The category of immunity required in the treatment of snake-bite.

Name the following:

The vaccine that helps to produce immunity against polio.

Write the full forms of AIDS.

Differentiate between: Active immunity and passive immunity

Write the full forms of: DPT vaccine

Differentiate between: Innate immunity and acquired immunity

Write the full forms of: TAB

Mention if the following statement is true (T) or false (F).

Treatment by the use of chemicals is known as allopathy.

Give the technical term for the kind of proteins produced in the blood to fight and destroy harmful micr

Describe the structure of an antibody.


Answer the following question:

Name the antibody which is most effective in allergies.

Give one significant difference between primary lymphoid organs and secondary lymphoid organs. Give one example of each.

Answer the following question.
Differentiate between the roles of B-lymphocytes and T-lymphocytes in generating immune responses.

Mention one application of the following:

State the function of interpherons.

State the role of the thymus as a lymphoid organ. Name the cells that are released from it and mention their function.

Mention one application of the following:

Both B-cells and T-cells are derived from __________.

Which cells stimulate B-cells to form antibodies?

Passive immunity is ______.

Which one of the following is the most accurate definition of the term ‘health’?

Enlist the four types of T- lymphocytes, responsible for immune response of our body.

Enlist any four barriers that contribute to innate immunity.

State the significance of mother’s milk to a newborn.

Explain the importance of epithelial surface in innate immunity.

Which cells are play a major role in non-specific defence against viral infections and tumors?

In acquired immunity there is a specific mechanism for each foreign molecule. This property is known as _______.

A similar disease generally does not reappear in a child due to the presence of which type of cells?

Virally infected cells release ______ to protect healthy cells from viral infection.

Coating of bacteria to facilitate subsequent phagocytosis by macrophages is known as ____________.

____________ are previously sensitized cells which retain the sensitization memory for a long time in the future.

Which type of T-cells are responsible for producing lymphokines and stimulation of B- cells?

All are forms of vaccines, EXCEPT ______.

Which cells deliver co-stimulatory signals for helper T-cells?

On coming in contact with an antigen, a sensitized T-lymphocyte produces ____________.

Production of which of the following is stimulated by secretin hormone?

______ provides a physical barrier. 

Innate immunity is ______

Which of the following components does not participate in innate immunity?

Write a short note on Acute Phase Proteins (APPs).


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