The major histocompatibility complex is a :
1. Series of complement-enhanced reactions to antigens
2. group of antigens, coded by a family of genes, on the surface of body cells 
3. form of autoimmunity 
4. the major cause of cancer 

The cell-mediated immunity inside the human body is carried out by 

1. T-lymphocytes

2. B-lymphocytes

3. thrombocytes

4. erythrocytes

The letter T in T-lymphocyte refers to

1. thyroid

2. thalamus

3. tonsil

4. thymus

The most active phagocytic white blood cells are

1. neutrophils and eosinophils

2. lymphocytes and macrophages

3. eosinophils and lymphocytes

4. neutrophils and monocytes

A foreign body giant cell is formed by

1. osteoclasts

2. mast cells

3. plasma cells

4. histiocytes

Memory cells are stored in

1. spleen

2. lymph nodes

3. both 1. and 2.

4. a specialised area of brain tissue

Stem cells arise from

1. bone marrow

2. yolk sac

3. foetal liver

4. all the above.

Which one of the following immune system components does not correctly match with its respective role?
1. Interferons - secreted by virus-infected cells and protect non-infected cells from further viral infection
2. B-lymphocytes-produces antibodies in response to pathogens into blood to fight with them
3. Macrophages-mucus secreting cells that trap microbes entering in the body
4. IgA-present in colostrum in early days of lactation and protect infant from diseases

The granulocytes that are actively phagocytic and the most numerous of the leukocytes circulating in the blood are the:

When searching for a donor for an organ transplant, doctors try to match the __________ of the donor and recipient as closely as possible.