. The comparative physiology of respiratory mechanisms. Respiration. FUNCTIONS OF BLOOD 107 absent from the powerful flight muscles of most birds. The storage function of myoglobin is probably of importance in static contractions when the blood supply becomes inadequate (Lindhard, 1920) and it may also have to function rhythmi- cally in the ordinary process of contraction. Ray Lankester (1872) made a very extensive and careful study of the distribution of haemoglobin and found it in many unexpected places. While it is otherwise absent from smooth muscle it is present in the rectal muscles of m
. The comparative physiology of respiratory mechanisms. Respiration. FUNCTIONS OF BLOOD 107 absent from the powerful flight muscles of most birds. The storage function of myoglobin is probably of importance in static contractions when the blood supply becomes inadequate (Lindhard, 1920) and it may also have to function rhythmi- cally in the ordinary process of contraction. Ray Lankester (1872) made a very extensive and careful study of the distribution of haemoglobin and found it in many unexpected places. While it is otherwise absent from smooth muscle it is present in the rectal muscles of man and probably other mammals. It is present also in the pharynx and radula muscles of gastropods (observed in Limnaa, Paludina, Littorina, Patella, Chiton, Aplysia) and in the pharyngeal tube of the worm Aphrodite. In all these cases the concentration is rather low, but in the chain of nerve ganglia of Aphrodite it is high enough to give the colour of mammalian blood. About the function in these locations we can only make Fig. 62. Part of the red organ in a young Gastrophilus larva. (Prenant.) Probablvca. 60 1. Certain insect larvae {Gastrophilus) living in the stomach of mammals, especially in the horse, have a peculiar organ made up of large red cells (Fig. 62) which contain haemoglobin in fairly high concentration and are arranged on tracheal branches which supply them with a large number of tra- cheoles. The animal must be exposed to periods of oxygen lack, and there can be no reasonable doubt that the organ. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
Size: 1638px × 1526px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectrespiration
