21. The Immune System

Mr. White developed neutropenia as a consequence of cancer chemotherapy, which destroyed much of his bone marrow. What other components of the immune system would be harmed by bone marrow destruction? Would you expect his hematocrit to be elevated or decreased? What effects would you expect to see from this change in hematocrit?

Mark the following statements as true or false. If a statement is false, correct is to make a true statement.

The secondary immune response is mediated by plasma cells.

Blocking the antigen receptors on the surface of lymphocytes would interfere with

(a) Phagocytosis of the antigen

(b) That lymphocyte's ability to produce antibodies

(c) Antigen recognition

(d) The ability of the lymphocyte to present antigen

(e) Opsonization of the antigen

Differentiate between humoral and cellular adaptive immunity.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

Dendritic cells may activate both T_H and T_C cells.

What is the importance of the variable region of T-cell receptors?

Which of the following answers is a major difference between cell-mediated and humoral immunity?