How do the products of glycolysis and krebs cycle relate to the electron transport chain?

During the process of glycolysis and krebs cycle (which is also known as tricarboxylic acid (TCA) cycle or citric acid cycle), there is breakdown of large molecules to product smaller molecules and energy including ATP.

So the answer to this would be:

Glycolysis and Krebs cycle produce the molecules that shuttle electrons to the electron transport chain

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explanation:

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.