. Essentials of biology presented in problems. Biology. THE BLOOD AND ITS CIRCULATION culation in the body. The pulmonary circulation takes the blood through the right auricle and ventricle, to the lungs, and passes it back to the left auricle. This is a relatively short circulation, the blood receiving in the lungs its supply of oxygen, and there giving up some of its carbon dioxide. The greater circulation is known as the systemic circulation; in this system, the blood leaves the left ventricle through the great dorsal aorta. A large part of the blood passes chrectly to the muscles; some of
. Essentials of biology presented in problems. Biology. THE BLOOD AND ITS CIRCULATION culation in the body. The pulmonary circulation takes the blood through the right auricle and ventricle, to the lungs, and passes it back to the left auricle. This is a relatively short circulation, the blood receiving in the lungs its supply of oxygen, and there giving up some of its carbon dioxide. The greater circulation is known as the systemic circulation; in this system, the blood leaves the left ventricle through the great dorsal aorta. A large part of the blood passes chrectly to the muscles; some of it goes to the nervous system, kidneys, skin, and other organs of the body. It gives up its supply of food and oxygen in these tissues, receives the waste Capillaries. Capillaries Diagram of the circulation of blood in a mammal. products of oxidation while passing through the capillaries, and returns to the right auricle through two large vessels known as the vence cavoe. It requires from twenty to thirty seconds only for the blood to make the complete circulation from the ventricle back again to the starting point. This means that the entire volume of blood in the human body passes three or four thousand times a day through the various organs of the body.' Portal Circulation. — Some of the blood, on its return to the heart, passes by an indirect path to the walls of the food tube and to its glands. From there it passes with its load of absorbed food to the Kver. Here the vein which carries the blood (called the portal vein) breaks up into capillaries around the cells of the liver. We have already learned that the liver is a great storehouse of animal sugar called glycogen. This glyco- gen is a food that may be easily ' See Hough and Sedgwick, The Human Mechanism, page 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1911
