Nobel Laureate August Krogh, born on this day, shed light on how our bodies supply more oxygen to our muscles when exercising than when resting.
Krogh developed methods for precisely measuring blood oxygen levels and explained how oxygen supply to muscles is regulated based on workload. Previously, it was thought that the blood's rate of flow increased during exertion. During the 1910s, however, Krogh showed that it was rather oxygen flow that was regulated by the opening of smaller blood vessels, capillaries. When resting, relatively few capillaries are open.
Read his paper 'The supply of oxygen to the tissues and the regulation of the capillary circulation': https://bit.ly/2Lu5TF9
Photo: August Krogh, 1926.
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