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.
B lymphocytes mature within the bone marrow. Mature, naive B cells then migrate to peripheral lymph nodes, where they await B cell activation mediated by dendritic cells and CD4+ effector cells. Once in the circulation, they express a single, unique immunoglobulin (IgM).