The two major functional classes of effector T lymphocytes are:
A. Helper T lymphocytes and cytotoxic T lymphocytes
B. Natural killer cells and cytotoxic T lymphocytes
C. Memory T cells and effector T cells
D. Helper cells and antigen-presenting cells
E. Cytotoxic T lymphocytes and target cells
ANS: A. T cells can be classified into effector subsets that perform different effector functions. Most effector T cells are either helper T lymphocytes, which promote macrophage and B cell responses to infections, or cytotoxic T lymphocytes, which directly kill infected cells. Natural killer cells are not T lymphocytes. Antigen-presenting cells usually are not T cells. Memory T cells are not effector T cells.
You might also like to view...
The lateral malleolus is formed by the:
A. proximal fibula. B. proximal talus. C. distal tibia. D. distal fibula.
List and describe the four word parts used to build medical terms
What will be an ideal response?
Acetaminophen is a(n)
A) sedative. B) stimulant. C) date-rape drug. D) over-the-counter pain-relief drug.
Reliability relates to which of the following questions?
a. How stable is the assessment over time? b. Is the assessment equally fair to all individuals or subgroups of individuals? c. How well does the assessment content match the program content? d. How much time, money, and staff effort must be dedicated for the assessment?