Which of the following cells are antigen-presenting cells?...

Name: Problem 4, Chapter 45: Biology
Uploaded: 2021-08-07T23:08:32-08:00
Duration: 3 min 10 s
Channel: Bryan Valdivia
Description: Which of the following cells are antigen-presenting cells? (a) NK cells and monocytes (b) macrophages and plasma cells (c) dendritic cells and macrophages (d) mast cells and B cells (e) memory T cells and plasma cells.

Which of the following cells are antigen-presenting cells? (a) NK cells and monocytes (b) macrophages and plasma cells (c) dendritic cells and macrophages (d) mast cells and B cells (e) memory T cells and plasma cells.

Key Concepts

MHC Class II Molecules

MHC class II molecules are proteins expressed on the surface of professional antigen-presenting cells. They bind and display peptides derived from extracellular proteins, allowing T helper cells to recognize and respond to specific antigens, which is key for initiating and sustaining immune responses.

Antigen-Presenting Cells (APCs)

APCs are immune cells that capture, process, and present antigens on their surface using MHC class II molecules. This presentation is essential for the activation of T helper cells, which then coordinate various aspects of the adaptive immune response.

Dendritic Cells

Dendritic cells are highly efficient antigen-presenting cells that serve as a bridge between the innate and adaptive immune systems. They capture antigens from peripheral tissues and migrate to lymphoid organs, where they present processed antigens to naive T cells, initiating immune responses.

Macrophages

Macrophages are versatile cells that act both as phagocytes and antigen-presenting cells. They ingest pathogens, process their antigens, and present these antigen fragments to T cells, playing a critical role in both immediate defense and the activation of adaptive immunity.

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