21. The Immune System

Introduction to T Lymphocytes

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

b. The immune response to a viral infection involves NK cells and different kinds of lymphocytes.
Open Question
CD4 markers are associated with (a) cytotoxic T cells, (b) regulatory T cells, (c) helper T cells, (d) all of these.
Multiple Choice
Self-reactive B cells are eliminated in the __________.
Multiple Choice
What is the importance of the variable region of T-cell receptors?
Open Question
Type I hypersensitivity is due to release of inflammatory mediators from_____, and type IV hypersensitivity is due to the actions of_____.

a. TH cells; macrophages
b. neutrophils; TH cells
c. B cells; TC cells
d. mast cells; TH cells
Multiple Choice
Which type of disease results from the inability of the immune system to distinguish self- from nonself-antigens?
Open Question
Lymphocytes that develop immunocompetence in the bone marrow area. T lymphocytes,b. B lymphocytes,c. NK cells,d. B and T lymphocytes.
Multiple Choice
Which of the following is NOT a component of TCRs?
Multiple Choice
Which of the following statements about cytotoxic T cells is true?
Open Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Cancer cells are destroyed by NK cells, TC cells, and macrophages.
Open Question
Give a function for each of the following: (a) cytotoxic T cells, (b) helper T cells, (c) regulatory T cells, (d) plasma cells,(e) NK cells,
Open Question
Define immunocompetence and self-tolerance. How is self-tolerance achieved?
Open Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. Dendritic cells may activate both TH and TC cells.
Multiple Choice
Which of the following types of cells is involved in adaptive immunity?
Multiple Choice
MHC II proteins are found on __________.