. First book on anatomy, physiology, and hygiene : for grammar schools and families . following experiment: — Experiment. Clasp the fore-arm about three inches belowthe elbow, then open and shut the fingers rapidly, and the 73—99. Give the physiology of the muscles. 73. How is every motion ofthe body produced ? 74. With what is each muscular fibre supplied ?What effect has this stimulus on the muscles ? 75. Do muscles remaincontracted a long time ? What is their appearance when in a state of con-traction ? 76. How can the alternate contraction and relaxation of themuscles be shown ? PHYSIOLOGY
. First book on anatomy, physiology, and hygiene : for grammar schools and families . following experiment: — Experiment. Clasp the fore-arm about three inches belowthe elbow, then open and shut the fingers rapidly, and the 73—99. Give the physiology of the muscles. 73. How is every motion ofthe body produced ? 74. With what is each muscular fibre supplied ?What effect has this stimulus on the muscles ? 75. Do muscles remaincontracted a long time ? What is their appearance when in a state of con-traction ? 76. How can the alternate contraction and relaxation of themuscles be shown ? PHYSIOLOGY OF THE MUSCLES. 31 swelling and relaxation of the muscles on the opposite sides ofthe arms, alternately with each other, will be felt correspond-ing with the movement of the fingers. While the fingers arebending, the inside muscles swell and the outside ones becomeflaccid; and, while the fingers are extending, the inside mus-cles relax and the outside ones swell. The alternate swellingand relaxation of opposing muscles may be felt in all the move-ments of the limbs. Fig. 2 4 A representation of the manner m which all of the joints of the body are moved. Fig. 22. X, The bone of the arm above the elbow. 2, One of the bones below theelbow 3 The muscle that bends the elbow. This muscle is united, by a tendon, tothe hone below the elbow, (4 ;) at the other extremity, to the bone above the elbow,(5 ) 6 The muscle that extends the elbow. 7, Its attachment to the pomt of theelbow 8 A weight in the hand, to be raised. The central part of the muscle (3)contracts, and its two ends are brought nearer together. The bones below the elboware brought to the lines shown by 9, 10, 11. The weight is raised in the direction ofthe curved line. When the muscle (6) contracts, the muscle (3) relaxes, and the el-bow is extended. 77. The eyebrows are elevated, or raised by the contractionof the muscles on the forehead, 1, fig. 23. 78. The eyes are closed by the contraction of the musclesthat s
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