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

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and done so often that weseldom appreciate the wonderful work which the bodyas a machine performs. 64 PHYSIOLOGY, HYGIENE AND SANITATION Muscle Wear and Repair. The muscle cells like otherparts of the body are being worn out every hour of the day. In health these dead cellsare renewed promptly and themuscles are as good and evenstronger than before. Everytime we walk, run, or movethere is damage done to themuscle cells; but the loss ofthese cells only adds to ourhealth if we know how to liveso the worn out cells are re-placed by new and better ones.The muscle by exercise becomesredder, firmer and stronger.Feel the arm of a small childand see how flabby it is; thenfeel the arm of one who doeshard labor or who exerciseshis muscles a great deal andsee how hard the muscles feeland how strong they are. Sucha person is in a position to en-joy the best of health if heobeys other laws of health aswell, does not drink liquors, orlead a dissolute life or in other ways weaken and poisonhis body.
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Fig 26.—Muscles of thethigh THE MUSCULAR SYSTEM 65 Summary The distinguishing difference of animals and plantsis the power of locomotion of the former by means ofmuscles, Muscles are the lean meat of an animal and aremade up of bundles of fibers bound together by connec-tive tissues. Connective tissue is one of the supporting tissues ofthe body and is found throughout its structure. The muscles number about five hundred and are of va-rious shapes to serve various purposes. Muscles have thethree main uses of producing motion, protecting delicateorgans, and supporting the skeleton and giving shape tothe body. Muscles are made up of cells which are bound togetherby connective tissue into bundles of cells or fibers. A tendon is a collection into one cord of all the bandsof connective tissue which binds the bundles of fibers ofa muscle together. Muscles are either voluntary or involuntary, dependingupon the ability of the will to operate them. A muscular sense is the result of training t

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