Question

1. Name two Primary Central Organs of the Immune System:
2. Name two Secondary Peripheral Organs of the Immune System:
3. Cells that break down foreign proteins, process them, and express peptide fragments on their membrane are called: _____________________________________________.
4. Local inflammation and phagocytosis of bacteria leads to activation of a complex series of proteolytic reactions and plasma proteins called:______________________________.
5. The region where the lymphocyte receptor binds the foreign antigen is known as the: _______________________________________________________________________.

Answer 1

1) Primary Central organ of immune system are where lymphocytes are formed and mature. They provide an environment for stem cells to divide and mature into B- and T- cells. It includes:

• Thymus
• Bone marrow

2) Secondary peripheral organ of immune system are sites for maturation of the preformed lymphocytes. Some immune action also occurs in these organs. It includes

• spleen
• Tonsil
• Lymph nodes
• MALT, GALT

3) ANTIGEN PRESENTING CELLS

Antigen presenting cells (APCs) Are cells that break down foreign proteins, process them, and express peptide fragments on their membrane.

4) COMPLEMENT CASCADE

The complement system activates through a triggered-enzyme cascade. It causes foreign and infected cells lysis, the phagocytosis of foreign particles and cell debris, and the inflammation of surrounding tissue.

5) EPITOPE

Epitope (or antigenic determinant) is a portion a foreign protein, or antigen that binds to a specific antigen receptor on the surface of a B cell. It is capable of initiating an immune response.

Hope this helps...

Best wishes!!