| Measure | Value |
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A teaching model of one working muscle cell, with rounded values. It assumes ATP demand stays high, glucose is the only fuel, cytosolic NADH is shuttled into the mitochondrion at full value, and the cell turns extra pyruvate into lactate. Each moving shape stands for a huge number of molecules, and everything is sped up. Percentages compare with the normal, well-oxygenated cell. Lactate is shown on a rough teaching scale. Complex IV binds O₂ so tightly that respiration keeps up until O₂ is very low, which is why lactate appears only near the bottom of the oxygen slider.
Make your prediction or calculation first. After you answer (or press Show me), the matching animation plays; calculation problems show an animated worked solution. Values: 2.5 ATP per NADH, 1.5 per FADH₂, unless the question says otherwise.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Fictional people and rounded, typical teaching values. Data sets are illustrative, shaped like real published results. For learning only, not medical advice.
Wrong picks are fine here. Each one tells you why.