August Krogh (physiologist)

August Krogh was a Danish physiologist renowned for his research on how blood vessels regulate blood flow, especially in muscles during exercise. He discovered that small blood vessels, called capillaries, can quickly expand or contract to meet the oxygen and nutrient needs of tissues. His work helped us understand physiological processes like respiration and circulation, earning him the Nobel Prize in Physiology or Medicine in 1920. Krogh's insights are fundamental to physiology, medicine, and sports science, highlighting the body's ability to adapt blood supply to various activity levels efficiently.