B cells
Answers. Best Answer: B lymphocytes or B cells secrete antibodies and act in humoral immunity. Humoral Immunity results in the production of antibodies that circulate around the body in blood and lymph (humors). Defends against: free bacteria and viruses. Cell-mediated Immunity: defense activities are carried out by specialized cells circulating around the body. Defends against: host cells infected with bacteria and viruses, fungi and protozoans, tissue transplants, own cancer cells. The body's Humoral immune system is dominated by circulating Antibodies (proteins that bind to other proteins specifically). These Abs are produced primarily by B Cell lymphocytes. The body's cell mediated immunity involved T cells, macrophages, and other leukocytes. All of the cells in the blood are derived from the same progenitor cells, the hematopoietic stem cells of the bone marrow. 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. • In the humoral immunity, the B-cells secrete antibodies whereas in the cell-mediated immunity, the T-cells do not secrete receptors. T-cell receptors are bound to the T-cells and the cells themselves bind with antigens. antigen specific immunity attributable to the production of antibody and of specific immune T lymphocytes (responsible for cell-mediated immunity), following exposure to an antigen, or passive transfer of antibody or immune lymphoid cells (adoptive immunity). active immunity.
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cell types are specifically responsible for humoral immunity