Cells that can directly attack target cells include all of the following except (a) macrophages,

step 1 Macrophages have tolite receptors, which allow the cells to recognize invaders and initiate infl

Cells that can directly attack target cells include all of...

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Key Concepts

Cytotoxic T Cells

Cytotoxic T cells are a type of lymphocyte that play a central role in cell-mediated immunity. They recognize and directly kill cells that are infected by viruses or have become cancerous by detecting specific antigenic peptides presented by MHC class I molecules on the target cells.

Natural Killer Cells

Natural Killer cells are an essential component of the innate immune system. They can directly attack and eliminate large numbers of virus-infected cells and tumor cells without requiring prior exposure to the pathogen or antigen, often through the recognition of altered or absent self-markers.

Helper T Cells

Helper T cells are pivotal in orchestrating the immune response by secreting cytokines that activate other immune cells, such as B cells, cytotoxic T cells, and macrophages. Unlike cytotoxic T cells and natural killer cells, helper T cells do not directly kill infected or malignant cells.

Macrophages

Macrophages are versatile immune cells involved in both the innate and adaptive immune responses. They primarily function by engulfing and digesting pathogens and debris, presenting antigens to T cells, and releasing cytokines, rather than directly killing target cells in the same manner as cytotoxic cells.

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