File:A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools (1889) (14783092113).jpg

Identifier: healthybodytextb00stow (find matches)
Title: A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools
Year: 1889 (1880s)
Authors: Stowell, Charles H(enry) 1850- (from old catalog)
Subjects: Human physiology
Publisher: Chicago, J.C. Buckbee and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Diagrams illustratino^ the action of muscles. Fig. 19. Muscles of the leg. Fig. 18. Muscles of the arm: s, theshoulder ; e, the elbow; H, thehand: m, muscles. are attached to move. In Fig. 18 it is clear that ifthe muscle on the front of the arm should contract, thefore-arm and the hand would be raised ; while if themuscle on the back of the arm should shorten, they wouldbe drawn down afrain. 52 A HEALTHY BODY. This principle is again illustrated in Fig. 19. It isclear that if the muscle on the front of the leg shouldshorten, it would pull on its tendon and raise the foot;while if the muscle on the back of the leg should shorten,it would pull on its tendon and raise the heel. Theseillustrations show the principle on which all the volun-tary muscles act. EXERCISE. 63 CHAPTER IX. EXERCISE. Exercise of the Muscles. If a person should place hisarm in a sling and not use it for a few months, it wouldgradually become smaller and smaller. The arm wouldbecome smaller because its muscles would

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