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Physiology For Dental Students

by Roy Gentry Pearce
Save 29% Save 29%
Current price ₹1,369.00
Original price ₹1,932.00
Original price ₹1,932.00
Original price ₹1,932.00
(-29%)
₹1,369.00
Current price ₹1,369.00

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Book cover type: Paperback
  • ISBN13: 9780217247887
  • Binding: Paperback
  • Subject: Medical, Nursing and Health Sciences
  • Publisher: RareBooks
  • Publisher Imprint: RareBooks
  • Publication Date:
  • Pages: 96
  • Original Price: USD 19.99
  • Language: English
  • Edition: N/A
  • Item Weight: 186 grams
  • BISAC Subject(s): N/A

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... the aorta and its branches, to the capillaries imbedded in the tissues. From these it is returned through the veins to the venae cavae, which discharge it into the right auricle. We may say, therefore, that the circulatory system consists of two circles of tubing interposed in which are two force pumps, the valves of which are so disposed as to allow the blood to flow in one direction only. I. The Heart. Anatomical Considerations.--The heart is suspended at its base by the large arteries, and lies practically free in a sac of tough fibrous tissue called the pericardium. On each side are the lungs, with the diaphragm below, the chest wall in front, and tliu oesophagus behind. (Fig. 15). The surface of the heart and the interior of the pericardial sac are bathed with a serous fluid, the pericardial fluid. The muscular fibers forming the walls of the four chambers of the heart are arranged so that their contrac-Fig. 15.--The position of the heart in the thorax. (T. Wingate Todd.) tion diminishes the size of the cavities and empties the heart of blood. From the study of the embryonic heart, and from comparative studies in the lower animals, (Fig. 16) we know that the heart has developed from a single tube, the division of the auricles and the ventricles being a rather late stage in the development of the mammalian heart. The fact that the two auricles beat synchronously, followed by the contraction of the two ventricles, is significant of the development of the auricles from the proximal, and of the ventricles from the distal end of the primitive cardiac tube. The fibers of the auricles run transversely, beginning and ending in the fibrous tissue which separates the auricles from the ventricles. The musculature of the ventricles is somewhat harder...

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