Accepts electrons from cytochrome c, ultimately transferring them to oxygen, forming H2O. in the process, 2 protons are pumped across the membrane. Complex IV is a terminal oxidoreductase, meaning that it transferes the elctrons to the terminal electron acceptor, which, in this case, is O2.
White blood cells called lymphocytes originate in the bone marrow but migrate to parts of the lymphatic system such as the lymph nodes, spleen, and thymus. There are two main types of lymphatic cells, T cells and B cells.
Activated B cells and T cells that recognize foreign protein antigen in the peripheral lymphoid tissue come. together to initiate humoral immune response. Within one or two days of antigen administration, naÃ¯ve CD4+. T cells recognize antigen presented by professional APCs in the T cell area of lymphoid organs.