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In aerobic respiration, why are electrons moved from organic macromolecules to electron carriers like NAD+. More specifically why is this middle man needed. Why can't the organic macromolecules transport the electron itself?

Question

In aerobic respiration, why are electrons moved from organic macromolecules to electron carriers like NAD+. More specifically why is this middle man needed. Why can't the organic macromolecules transport the electron itself?

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Step 1

Cellular respiration is the process of utilizing oxygen and food molecules to create energy, carbon dioxide, water, and waste products. Respiration consists of three separate metabolic phases, namely, glycolysis, Krebs’s cycle, and the electron transport chain (ETC).

Step 2

Cellular respiration involves many reactions in which electrons are passed from one molecule to another. Reactions involving electron transfers are known as oxidation-reduction reactions (or redox reactions).

FADH2 and NADH are created from FAD and NAD+ through reduction-oxidation reactions in the Krebs cycle during respiration.

These intermediates are called electron car...

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