During the Krebs Cycle (also known as the citric acid cycle or TCA cycle), the two other molecules that are released in addition to carbon dioxide (CO₂) are:
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NADH: This is a reduced form of nicotinamide adenine dinucleotide (NAD⁺) and is an important electron carrier that plays a critical role in cellular respiration and energy production.
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FADH₂: This is the reduced form of flavin adenine dinucleotide (FAD) and also serves as an electron carrier in the respiratory chain, similar to NADH.
Both NADH and FADH₂ are crucial for the subsequent steps in cellular respiration, specifically in the electron transport chain, where their high-energy electrons are used to generate ATP.