During the electron transport chain (ETC) six oxygen molecules are used. This stage is also called the ATP synthesis stage because during this stage a large amount of ATP is produced, 32 ATP molecules to be exact! Six water molecules are given off as well.

Video segment. Assistance may be required. Watch the following video to learn how electrons are passed through different proteins and ATP is produced.

This activity might not be viewable on your mobile device.Check your Understanding! Answer these questions to show what you have learned about the Electron Transport Chain.

Interactive exercise. Assistance may be required.