August Krogh
August Krogh
Schack August Steenberg Krogh ForMemRSwas a Danish professor at the department of zoophysiology at the University of Copenhagen from 1916-1945. He contributed a number of fundamental discoveries within several fields of physiology, and is famous for developing the Krogh Principle...
NationalityDanish
ProfessionScientist
Date of Birth15 November 1874
CountryDenmark
adapted birds definitely fact fly function greatly mechanisms reduced
The respiratory mechanisms of birds are definitely adapted to the function of flight, as evidenced by the fact that birds which do not fly (Apteryx, Penguins) show these adaptations in a greatly reduced form.
considered functions man number organs quite recognize system
The circulatory system of man and the vertebrate animals can be considered as made up of a small number of organs or subordinate systems, which are easy to recognize anatomically, and the functions of which are on the whole quite distinct.
amount greatly honour incentive nobel prize provide simplify strongest tremendous valuable work
The tremendous honour of the Nobel Prize is of the strongest incentive to me in my work, while the amount of the Prize will greatly simplify my task and provide me with much valuable help in my work.
affinity complex depending hydrogen oxygen
The affinity of blood or pure haemoglobins for oxygen is a complex phenomenon, depending upon a number of conditions, the most important of which are temperature and hydrogen ion concentration.
both fairly few found mammals microscope muscles observe observed possible quite reflected regular resting reveals source using
I found it possible to observe at least the superficial capillaries of muscles both in the frog and in mammals through a binocular microscope, using strong reflected light as a source of illumination. Resting muscles observed in this way are usually quite pale, and the microscope reveals only a few capillaries at fairly regular intervals.
effective less low muscular regularly since system veins
Since muscular contractions are usually more or less regularly alternated with relaxations, the system of valves makes of the veins of every muscle a very effective pump, capable of maintaining a low pressure in the muscle capillaries.
fishes movements necessary obtain rapidly simply
There can be little doubt that fishes swimming rapidly do not make respiratory movements at all, but obtain the necessary ventilation of the gills simply by opening the mouth.
few large number
For a large number of problems, there will be some animal of choice, or a few such animals, on which it can be most conveniently studied.
oxygen use muscles
Muscles do not use oxygen at a constant rate.
men breathing tests
In man, the mechanical breathing is essential to life, and it is one of the old tests for death to see whether these movements have ceased completely.
oxygen regulation trustworthy
The absorption of oxygen and the elimination of carbon dioxide in the lungs take place by diffusion alone. There is no trustworthy evidence of any regulation of this process on the part of the organism.
done may facts
The theory of the lung as a gland has justified its existence and done excellent service in bringing forward facts, which shall survive any theoretical construction that has been or may hereafter be put upon them.
ideas giving may
We may fondly imagine that we are impartial seekers after truth, but with a few exceptions, to which I know that I do not belong, we are influenced-and sometimes strongly-by our personal bias; and we give our best thoughts to those ideas which we have to defend.
against bent caught current direct edge elasticity evidence flowing obtained watched wonderful
The most direct evidence of the wonderful plasticity and elasticity of red corpuscles is obtained when they are watched in a current, where they can be caught against a projecting edge and bent by the pressure of the current flowing past them.