File:The human body. A beginner's text-book of anatomy, physiology and hygiene (1884) (14782797292).jpg

Identifier: humanbodybeginne00mart (find matches)
Title: The human body. A beginner's text-book of anatomy, physiology and hygiene ..
Year: 1884 (1880s)
Authors: Martin, H. Newell (Henry Newell), 1848-1896 Martin, Hetty Cary, (from old catalog) joint author
Subjects: Physiology
Publisher: New York, H. Holt and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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the pouring of bile intothe small intestine. They are but a few examples outof hundreds, which show that our organs work togetherfor the good of the whole body, and often help one an-other without our planning it, or our minds having any-thing to do with it. Very clearly there must be somemeans by which the various organs are made to work insuch harmony. 3. The Nervous System.—When we try to imagine howeach organ might be put in communication with all theothers, probably the first idea that comes to mind is that 2. Of what is coughing an example ? How do the heart and lungshelp the muscles during exercise ? How do the blood-vessels of theskin keep the rest of the body from being too much cooled ? How dothe sweat-glands aid the rest of the body ? How does the gall-bladderaid the small intestine in digesting? In what way are the above ac-tions performed ? What do these few examples show ? 3. In thinking of communication between the organs, what idea 192 DIAGRAM OF THE NERVOUS SYSTEM.
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Fig. sff.—Diagram illustrating: the general arrangfement of the nervous system. THE CHIEF NERVE-CENTRES, 193 there might be some sort of telegraph-system in thebody. If there were something like telegraph-wiresrunning from all the organs to a central office or ex-change, then word of the state and needs of any organmight be sent from it to the central office, and propermessages be sent out from the central office to thoseother organs whose help was wanted. This is in factsomething very like what does take place. If the dead body be dissected, a great many whitecords are found which run all through it, and go intothe skin, and the mucous membranes, and the heart, andthe lungs, and each muscle, and so forth. These cords arenerves. If one be followed back from where it enters anyof the above parts, it will be found at last tq join amuch larger mass to wliich other nerves are also united.This mass is a fiejve-centre. The nerves and nerve-centres together make the nervous system. The ner

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