Physiology, hygiene and sanitation, an elementary textbook of physiology, with special attention given to hygiene and sanitation (1919) (14762040511)

Identifier: physiologyhygien00heiz (find matches)

Title: Physiology, hygiene and sanitation, an elementary textbook of physiology, with special attention given to hygiene and sanitation

Year: 1919 (1910s)

Authors: Heizer, W. L. (W. Lucien), b. 1880

Subjects: Physiology Hygiene Sanitation

Publisher: Louisville, Ky., C.T. Dearing Printing Co., Incorporated

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

NE AND SANITATION Ganglia and their connecting nerves complete it. Adouble row of ganglia (collections of white and gray mat-ter) is placed on each side of the spinal column andbranches from the spinal nerves run into them. Theganglia connect with each other and send nerve fibersto the spinal nerves. The function of a sympatheticnervous system is to establish aclose working relation of sympa-thy between many of the organsof the body. For example, whenthe muscles do heavy work, theheart beats faster, the lungsbreathe more air, the sweat glandswork, the blood vessels in the skinexpand, because the nerve mes-sages to all these organs are har-monized so they may do team-work. Imagine what confusionthere would be if the brain had tothink to tell each organ what todo, when to do and how to do it. The sympathetic nervous sys-tem looks after all the vital opera-tions of the body. Ganglia are distributed in other partsof the body to insure quick delivery and reception ofnerve impulses. Summary

Text Appearing After Image:

Fig:. 137.—Showing nerveconnection with a mus-cle which acts with theaid of the sympatheticnervous system. M.Muscle. N. Nerves toganglia. C. Connectionof ganglia with eachother and other nerves. The brain, the seat of the nervous system, weighingabout three pounds, is divided into the cerebrum and thecerebellum. ORGANS OF THE NERVOUS SYSTEM 265 It is the organ with which we think and are madeaware of sensations. In structure, it is made up of nerve cells forming thewhite and gray matter. The cerebrum is the seat of the mind and its nervecells control the voluntary movements of the body. The spinal cord is a continuation of the nerve tissueof the brain. It gives off thirty-one pairs of spinal nerves,each having a motor and sensory root. Many of them in a plexus give off connecting fibers toother nerves to co-ordinate the work of the organs of thebody. Nerve cells form all the nerve tissue of the bodyand by branching they form a network of communica-tion between one another. Nerves ar

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1919

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