Photograph of August Krogh, who showed that blood capacity for oxygen is influenced by carbon dioxide tension. Krogh was awarded the Nobel Prize in Physiology and Medicine in 1920.
Photograph of Charles Robert Richet, who described anaphylaxis and indicated its functional aspects. He was given the Nobel Prize in Physiology in 1910.
Portrait of Hermann Ludwig Ferdinand von Helmholtz, who studied physiological phenomena, paving the way for acceptance of the basic principle of energy conservation in physiology.