The hydrogen removed during dehydrogenation in glycolysis and the Kreb's cycle is down the respiratory chain until it eventually combines with oxygen to form water. Cytochromes contain haem with Fe. Cytochrome oxidase contains Cu and is inhibited by cyanide. The mitochondrion Describe the sites of Kreb's cycle and oxidative phosphorylation in a mitochondrion. The number of mitochondria in a cell depends upon its activity eg liver cells have 1,000.
Shape varies eg rod, spiral or branched.
Length varies from 1.5um - 10um. Note the envelope of two phospholipid bilayers. The inner one is folded into cristae to increase its surface area. This inner membrane is less permeable to small molecules and is covered in stalked particles. These particles are ATP synthetase enzymes.