The overall reaction for respiration is essentially the reverse of carbon fixation.

呼吸的总体反应基本上与碳固定相反。

To see how reduction potentials work in half reactions and combine in an overall reaction, let's consider a galvanic cell where zinc is oxidized and copper ions are reduced.

为了了解还原电位如何在半反应中起作用并在整个反应中结合，让我们考虑一个原电池， 其中锌被氧化而铜离子被还原。