Nadh Fadh2
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12:07
NADH Fluorescence Imaging of Isolated Biventricular Working Rabbit Hearts
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Cited by 24 •
2012
The objective is to monitor the mitochondrial redox state of isolated hearts within the context of physiologic preload and afterload pressures. A biventricular working rabbit heart model is presented. High spatiotemporal resolution fluorescence imaging of NADH is used to monitor the mitochondrial redox state of epicardial tissue.
12:03
Detection of Microregional Hypoxia in Mouse Cerebral Cortex by Two-photon Imaging of Endogenous NADH Fluorescence
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Cited by 11 •
2012
Here we describe a method to directly visualize microregional tissue hypoxia in the mouse cortex in vivo. It is based on concurrent two-photon imaging of nicotinamide adenine dinucleotide (NADH) and the cortical microcirculation. This method is useful for high resolution analysis of tissue oxygen supply.
01:29
Role of Reduced Coenzymes NADH and FADH₂
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2025
The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
01:31
ATP Yield
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2019
Cellular respiration produces 30 - 32 ATP per glucose molecule. Although most of the ATP results from oxidative phosphorylation and the electron transport chain (ETC), 4 ATP are gained beforehand (2 from glycolysis and 2 from the citric acid cycle). The ETC is embedded in the inner mitochondrial membrane and is comprised of four main protein complexes and an ATP synthase. NADH and FADH2 pass electrons to these complexes, which pump protons into the intermembrane space. This distribution of...
02:36
The Citric Acid Cycle
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2019
The citric acid cycle, also known as the Krebs cycle or TCA cycle, consists of several energy-generating reactions that yield one ATP molecule, three NADH molecules, one FADH2 molecule, and two CO2 molecules. Acetyl CoA is the point-of-entry into the citric acid cycle, which occurs in the inner membrane (i.e., matrix) of mitochondria in eukaryotic cells or the cytoplasm of prokaryotic cells. Prior to the citric acid cycle, pyruvate oxidation produced two acetyl CoA molecules per glucose...
FAQs
NADH donates electrons to Complex I, whereas FADH2 enters through Complex II. Because the carriers begin electron transfer at different points, their electrons follow different portions of the chain before contributing to proton pumping. This difference helps explain why oxidation of these carriers is associated with distinct ATP yields during oxidative phosphorylation.
Electron transfer through the mitochondrial chain powers the movement of protons across the inner mitochondrial membrane. This creates a proton gradient, meaning a difference in proton concentration across the membrane. ATP synthase uses that gradient to drive ATP production, connecting carrier oxidation with the cell’s usable energy supply.
The carrier determines where electrons enter the electron transport chain, which influences the sequence of transfers available to support proton pumping. NADH and FADH2 therefore contribute differently to ATP production rather than producing identical outcomes. Comparing them clarifies how nutrient breakdown becomes chemically stored energy through oxidative phosphorylation.
Carbohydrates, fats, and other fuels are broken down into processes that transfer energy to NADH and FADH2. These carriers then deliver that energy to the mitochondrial electron transport chain. Their shared role links diverse nutrient sources to ATP production, making them useful for understanding metabolism and cellular energy balance.
A comparison tracks where each carrier delivers electrons, how electron transfer supports proton movement, and how that movement drives ATP synthase. This framework helps evaluate mitochondrial energy production without treating all reduced carriers as equivalent. It is especially relevant when studying changes in energy balance or cellular responses to disrupted respiration.
Disrupted respiration can be considered by examining the connection among carrier oxidation, electron transport, proton-gradient formation, and ATP synthesis. NADH and FADH2 provide distinct points for following that connection because they enter the chain at different complexes. Their comparison can therefore support analysis of mitochondrial function and altered cellular energy production.