The demand rises
From the first strides the leg muscles need far more energy each second than they did at rest, and the systems that supply them begin to scale up.
Unreviewed draftIndividual responses may vary; this is not a personal prediction.
5 km run scenario
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Muscle pulls glucose in
Contraction itself moves glucose transporters to the muscle surface, so working muscle takes in more glucose even as the insulin signal in the blood eases downward.
The liver holds the supply steady
The liver releases glucose into the bloodstream at close to the rate the muscles are removing it, which is why the displayed blood range moves so little.
Breathing scales up
Breaths become deeper and more frequent, moving much more air through the lungs each minute so that oxygen keeps reaching the blood.
Interactive 3D is loading into this same frame contract.