<prompt> CO acts by inhibiting which component of respiratory chainCytochrome BCytochrome C oxidaseNADH CoQ reductaseOxidative phosphorylation  <response>: Carbon monoxide is toxic for mitochondria in man, altering the mitochondrial respiratory chain at the cytochrome c oxidase level. This inhibition in cytochrome c oxidase may play a role in the development of the symptoms observed in acute CO poisoning, and in some diseases related to smoking 