Which enzyme hands over electrons to oxygen during oxidative phosphorylation ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Oxidative Phosphorylation**: Oxidative phosphorylation is a metabolic pathway that takes place in the mitochondria, where ATP is produced as a result of the transfer of electrons through the electron transport chain.

2. **Electron Transport Chain (ETC)**: The electron transport chain consists of a series of protein complexes located in the inner mitochondrial membrane. The main function of these complexes is to transfer electrons from electron donors to electron acceptors via redox reactions.

3. **Key Complexes in the ETC**: There are four main complexes involved in the electron transport chain:
- **Complex I**: NADH dehydrogenase
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