Danish physiologist who won the 1920 Nobel Prize in Physiology or Medicine for discovering the mechanism regulating the motor control of capillaries — demonstrating that the body recruits additional capillaries during exercise rather than simply increasing flow through existing ones.
Discovered active capillary recruitment — Krogh showed that during exercise the body opens previously closed capillary networks (rather than just pumping blood faster), dramatically increasing the surface area available for oxygen exchange; this fundamental mechanism underlies all modern exercise physiology.
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