cytochrome-c oxidase activity(GO:0004129) heme-copper terminal oxidase activity(GO:0015002) oxidoreductase activity, acting on a heme group of donors, oxygen as acceptor(GO:0016676)
ubiquinol-cytochrome-c reductase activity(GO:0008121) oxidoreductase activity, acting on diphenols and related substances as donors, cytochrome as acceptor(GO:0016681)