Antigen-presenting cells behave as ________.
A) interferons
B) pyrogens
C) macrophages
D) natural killer cells
E) complement

Question

Quizplus · Accepted Answer

Antigen-presenting cells (APCs) are specialized cells that process and present antigens to T cells in order to initiate an immune response. Macrophages are a type of APC that play a key role in engulfing and digesting foreign invaders like bacteria, and then presenting their antigens on their cell surface to T cells. Thus, choice C, macrophages, is the correct answer. Interferons (A) are signaling proteins that help to activate immune responses against viral infections, but they are not APCs. Pyrogens (B) are substances that cause fever, but they are not APCs. Natural killer cells (D) are lymphocytes that can recognize and kill certain infected or abnormal cells, but they do not present antigens to T cells. Complement (E) is a system of blood proteins that helps to enhance and coordinate the immune response, but it is not an APC.

Antigen-Presenting Cells Behave as ________