Which of the following cell types is specifically responsible for cell-mediated immunity?
Cell mediated immunity involves the activation of macrophages, natural killer cells (NK), antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen. Lymphocytes are a kind of leukocytes, so precisely all forms of leukocytes are not responsible for cell mediated immunity. B cells are responsible for humoral (Antibody) immunity & not the cell mediated immunity.
If you can only choose one of those answers, I would pick Natural Killer cells. B cells are part of the humoral immunity (not the cell-mediated immunity). Leukocytes are any white blood cell (B cells, T cells, macrophages, granulocytes, etc.), only some of which are involved in cell-mediated immunity. Lymphocytes include both T and B cells and only Cytotoxic (CD8+) T cells are involved in the cell mediated immunity. http://en.wikipedia.org/wiki/Cell-mediat… I hope this helps!
