File:A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools (1889) (14740248876).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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)irits make it beat slowly.Excitement, as joy, anger, etc., make it beat fast; exer-cise makes it beat fast. It beats faster when we arestanding than when we are sitting; faster when sittingthan when lying; faster when awake than when asleep. The number of beats is about ten more each minutein women than it is in men: in man ^ it is between sixtyand seventy a min-ute. Some personshave naturally eithera slow or a quickpulse. The numberis less in old age,while in young chil-dren it is as high as120 to 140 a minute. Fig. 39. a, a small artery; c, capillaries;The Sounds of the v, a small vein. Heart. Each time that the heart beats it makes two sounds. These canbe distinctly heard if the ear be placed over the heart.One sound quickly follows the other, and then thereis a period of silence. You will notice that thesesounds are not alike. They are always of a certaincharacter in health, so that the physician is able to tell,by listening to them, whether the heart is diseased or not.
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120 A HEALTHY BODY. The Pulse. The pulse at the wrist is caused by thesudden expansion of the artery. The heart pushes somuch blood into the arteries that it makes them swell,or expand, at each beat. Arteries, Veins, and Capillaries. The largest artery inthe body is the one that comes from the left ventricle of the heart; it iscalled the aorta.Fig. 38 shows thatnot far from theheart the aorta givesoff many branches.These branchesdivide again andagain, until theybecome so smallthat they cannotbe seen with theunaided eye, and amicroscope is neces-sary to study them.These fine branchesare called capillaries.Fig. 39 illustrates the way in which a small arterydivides to make the capillaries, and also how thesecapillaries unite to make a small vein. It is while theblood is in these capillaries that the tissues take fromit the oxygen and other nourishment for their growthand repair.

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