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. — August Krogh Copy Share Image
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. — August Krogh Copy Share Image
The circulatory system of man and the vertebrate animals can be considered as made up of a small number of organs or subordinate systems,… — August Krogh Copy Share Image
The affinity of blood or pure haemoglobins for oxygen is a complex phenomenon, depending upon a number of conditions, the most important of which… — August Krogh Copy Share Image
The most direct evidence of the wonderful plasticity and elasticity of red corpuscles is obtained when they are watched in a current, where they… — August Krogh Copy Share Image
When a suitable quantity of India ink is introduced into the circulation of a living anaesthetized animal, it is evenly mixed with the blood,… — August Krogh Copy Share Image
In the numerous observations made in my laboratory upon this object, we have only once seen a combination of vessels in which there might… — August Krogh Copy Share Image
In the tissues generally, and in such a cavity as the abdomen, the pressure is everywhere and practically always very nearly atmospheric, and must… — August Krogh Copy Share Image
Since muscular contractions are usually more or less regularly alternated with relaxations, the system of valves makes of the veins of every muscle a… — August Krogh Copy Share Image
The theory of the lung as a gland has justified its existence and done excellent service in bringing forward facts, which shall survive any… — August Krogh Copy Share Image
We may fondly imagine that we are impartial seekers after truth, but with a few exceptions, to which I know that I do not… — August Krogh Copy Share Image
In the giraffe with a total height of 5 m., the heart is at a height of about 2.5 m., and it would be… — August Krogh Copy Share Image
In many organisms, including man, the mechanical respiration and the circulation of the blood are 'regulated' so as to correspond to the demand of… — August Krogh Copy Share Image
The respiratory mechanisms of birds are definitely adapted to the function of flight, as evidenced by the fact that birds which do not fly… — August Krogh Copy Share Image
