It is no doubt technically possible to study metabolism and respiration of fishes during swimming at a constant rate, and of certain insects and birds during flight, and to obtain information similar to that obtained on man during work on a bicycle ergometer or a treadmill. August Krogh bicyclebirdconstant share on social
Muscles do not use oxygen at a constant rate. August Krogh constantmuscleoxygen Change image and share on social
In the numerous observations made in my laboratory upon this object, we have only once seen a combination of vessels in which there might be a direct communication between a small artery and a vein, though the two observers could not come to a final conclusion on the point. August Krogh arterycombinationcommunication share on social
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. August Krogh bendcatchcorpuscle share on social
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. August Krogh affinitybloodcomplex Change image and share on social
In the tissues generally, and in such a cavity as the abdomen, the pressure is everywhere and practically always very nearly atmospheric, and must be so, because the integuments give way very easily to any excess of pressure, whether positive or negative. August Krogh abdomenatmosphericcavity share on social
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. August Krogh breatheceasecompletely Change image and share on social
