20 Questions
What is immunity?
Resistance to infection
What are the important cells of the immune system?
Lymphocytes, Macrophages, Eosinophils, Basophils, Neutrophils, Antigen presenting cells, Mast cells, Platelets
Name two types of immunity.
Innate immunity and acquired immunity
What are stem cells?
Undifferentiated embryonic cells with the ability to develop into any type of blood cells
What are the three types of lymphocytes?
B lymphocytes, T lymphocytes, null cells
Where do stem cells originate in the early embryo and migrate to later?
Yolk sac, liver, bone marrow
Where do B lymphocytes mature?
Bursa of Fabricius (in Aves) or in bone marrow (in mammals)
What do T lymphocytes bring about?
Cell mediated immunity
What are the two types of null cells?
Natural killer cells, and killer cells
What do the B lymphocytes produce?
Antibodies
What unique proteins are found on the surface membrane of lymphocytes?
Surface markers
Where do B lymphocytes mature in mammals?
Bone marrow
What is the diameter range of lymphocytes?
7 to 12 µm
What is the percentage of null cells among the total lymphocytes?
3%
Under the influence of which hormones do T lymphocytes mature?
Thymic hormones
What are the surface markers of B cells?
Ia protein, Fc receptor, CR1 and CR3 receptors, SIg (surface immunoglobulin)
What is the process called when immunoglobulins on the B cell surface begin to accumulate in distinct foci after antigen is added?
Lymphocyte capping
What do the null cells represent in the context of lymphocytes?
A third population of lymphocytes
Where are B lymphocytes highly concentrated?
In the lymph nodes and spleen
What is the source of B cells in the immune system?
Haemopoietic stem cells
Test your knowledge about the cells of the immune system and the concept of immunity. Explore the classification of immunity into innate and acquired types and understand the process of recognition and disposal of foreign material in the body.
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