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
21. The Immune System
Introduction to T Lymphocytes
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Which of the following statements about cytotoxic T cells is true?
A
When cytotoxic T cells encounter an antigen, they produce cytokines to stimulate other immune cells.
B
When cytotoxic T cells encounter “presented” antigens, they send signals triggering apoptosis in the infected cell.
C
When cytotoxic T cells encounter an antigen, they recruit B cells to produce antibodies.
D
Cytotoxic t cells only recognize and respond to “free” antigens.
Verified step by step guidance1
Understand the role of cytotoxic T cells in the immune system. They are a type of T cell that is primarily responsible for killing infected cells.
Recognize that cytotoxic T cells require antigens to be presented to them by other cells, typically through Major Histocompatibility Complex (MHC) molecules, to become activated.
Identify that once activated, cytotoxic T cells release signals that can induce apoptosis, or programmed cell death, in the infected cells.
Differentiate between the roles of cytotoxic T cells and other immune cells, such as B cells, which are responsible for producing antibodies.
Clarify that cytotoxic T cells do not respond to 'free' antigens directly; they require antigen presentation to recognize and respond effectively.
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