Cells of the Immune System and Immunity

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 Signup and view all the answers

What are the three types of lymphocytes?

B lymphocytes, T lymphocytes, null cells Signup and view all the answers

Where do stem cells originate in the early embryo and migrate to later?

Yolk sac, liver, bone marrow Signup and view all the answers

Where do B lymphocytes mature?

Bursa of Fabricius (in Aves) or in bone marrow (in mammals) Signup and view all the answers

What do T lymphocytes bring about?

Cell mediated immunity Signup and view all the answers

What are the two types of null cells?

Natural killer cells, and killer cells Signup and view all the answers

What do the B lymphocytes produce?

Antibodies Signup and view all the answers

What unique proteins are found on the surface membrane of lymphocytes?

Surface markers Signup and view all the answers

Where do B lymphocytes mature in mammals?

Bone marrow Signup and view all the answers

What is the diameter range of lymphocytes?

7 to 12 µm Signup and view all the answers

What is the percentage of null cells among the total lymphocytes?

3% Signup and view all the answers

Under the influence of which hormones do T lymphocytes mature?

Thymic hormones Signup and view all the answers

What are the surface markers of B cells?

Ia protein, Fc receptor, CR1 and CR3 receptors, SIg (surface immunoglobulin) Signup and view all the answers

What is the process called when immunoglobulins on the B cell surface begin to accumulate in distinct foci after antigen is added?

Lymphocyte capping Signup and view all the answers

What do the null cells represent in the context of lymphocytes?

A third population of lymphocytes Signup and view all the answers

Where are B lymphocytes highly concentrated?

In the lymph nodes and spleen Signup and view all the answers

What is the source of B cells in the immune system?

Haemopoietic stem cells Signup and view all the answers