Final answer:
Complex IV, also known as cytochrome c oxidase, is the final complex in the electron transport chain. It reduces oxygen into water and pumps H+ ions from the matrix to the intermembrane space.
Step-by-step explanation:
Complex IV, also known as cytochrome c oxidase, is the final complex in the electron transport chain. It contains several subunits, two heme groups, and several metal ion cofactors, including three atoms of copper, one magnesium, and one zinc. Complex IV reduces oxygen into water at the expense of oxidation of Cyt c and pumps 4 H* from matrix to intermembrane space.