Identifier: anatomyphysiolog00jord (find matches)
Title: "Anatomy, physiology and laws of health;"
Year: 1885 (1880s)
Authors: Jordan, Johnson H. (from old catalog)
Subjects: Medicine, Popular Anatomy Physiology
Publisher: Chicago, W. H. Moore & co.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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and causing the blood toflow. These little vessels are called capillary (which means hair) onaccount of their being so small; but a hair, compared with suchtubes, says Magendie, is a huge cylinder! They are so small thatthe aid of a microscope is required to see them. One of the character-istics of inflammation is the red appearance of the part; this is owingsimply to the met that the capillary vessels are distended and highlycharged with blood. The same is seen when a lady blushes. It isthe stagnation of the blood in its passage through these vessels thatcauses inflammation. The capillaries perform the important func-tions of secretion and nutrition ; they extract from the blood itsnutricious materials and convert them into bone, muscle, and thevarious other tissues of the body. Fig 7. Fig. 7—The Venous System:— 1. The right auricle. 2. Descending vena cava. 3. Ascending vena cava. 4. Right and left iliac veins. 5. Right and left subclavian veins.C». Jugular vein of right side.
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The Venous System. 30 ANATOMY, PHYSIOLOGY AND As the veins proceed, their various branches, like the branches of ariver, coalesce or unite, to form still larger branches, till they finallyterminate in the large trunks, which convey the blood direct to theheart. In diameter the veins are much larger than the arteries.They are also furnished with numerous valves, particularly the largeveins of the extremities, which allow the blood to flow freely towardthe heart, but operate to prevent any retrograde movement. The veins that receive the blood from all parts of the body, follownearly the same course as the arteries, and at last unite to form twolarge trunks, called the ascending vena cava and the descending venacava. The ascending cava is that which receives the blood from thelower extremities and the regions of the abdomen ; while the descend-ing cava receives the blood from the upper parts of the body; andboth empty their contents into the right auricle of the heart. There is a peculia

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