. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. 200 CIKGULATION lected into veins by which the blood is returned to the right auricle of the heart. The blood supplied to the head by the carotids is re- turned to the heart by two large veins (the jugulars) pass- ing down each side of the neck; while from the arms come two other veins. These four veins finally unite to form the superior vena cava which opens into the right auricle of the heart. In a similar manner various veins return the blood from the lower part of the body and unite in one common vein (the i
. A text-book in general physiology and anatomy. Physiology, Comparative; Anatomy. 200 CIKGULATION lected into veins by which the blood is returned to the right auricle of the heart. The blood supplied to the head by the carotids is re- turned to the heart by two large veins (the jugulars) pass- ing down each side of the neck; while from the arms come two other veins. These four veins finally unite to form the superior vena cava which opens into the right auricle of the heart. In a similar manner various veins return the blood from the lower part of the body and unite in one common vein (the inferior vena cava) which also opens into the right auricle of the heart It is this lower part of the venous system wMch collects the food from the digestive system. The portal circulation. — The veins which are found in the walls of the stomach and intestine do not convey the blood directly to the in- ferior vena cava. After collecting the food from these organs these veins are collected into a single large vein (the portal vein) which passes di- rectly to the hver. Here this vein splits up into capillaries again, which in turn collect again into a second vein (the Jiepatic vein). This latter pours its blood into the inferior-vena cava. It is to be noted in this case that the capil- laries of the Uver arise from and unite again into veins, and that the food is thus forced to pass through two sepa- rate sets of capillaries before entering the heart. This branching of the portal vein into capillaries is the only. Fig. 76 — Diagram of the portal 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 Eddy, Walter Hollis, b. 1877. New York, Cincinnati [etc. ] American book Co
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