Der menschliche Körper ist ein Anfänger Lehrbuch der Anatomie, Physiologie und Hygiene. Das Wasser in der Stadt verwendet wurden alle backthrough der Kanalisation (Antwort auf die Venen), zu anotherreservoir platziert neben der man es aus; gestartet und thencew ^ ere durch eine Reihe von Rohren (Die pulmonaryartery und seine Äste) in eine reinigende Apparate; öffnen Zurück zum ersten Behälter, der ganze Prozess viel wouldbe wie die Zirkulation des Blutes durchgeführt. Die beiden Reser-voirs wäre das Herz, die doppelt so groß ist, und thepurifying Vorrichtung würde die Lungen darstellen. 22. Der Puls.-Die Arterien ar

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The human body A beginner's text-book of anatomy, physiology and hygiene .. . the water used in the city were all carried backthrough the sewers (answering to the veins), to anotherreservoir placed beside the one it started from; and thencew^ere carried by a different set of pipes (the pulmonaryartery and its branches) into a purifying apparatus; andthen back to the first reservoir, the whole process wouldbe much like the circulation of the blood. The two reser-voirs would represent the heart, which is double, and thepurifying apparatus would represent the lungs. 22. The Pulse.—The arteries are as elastic as rubber tubing. Every time the heart beats and forces blood into them, their walls are stretched to make room for it. When an artery lies near the surface, this stretching to be done with the used water to make the illustration complete ?What would represent the lungs ?22. What is the pulse ? 14^ THE CAPILLARIES. can be felt through the skin. It is known as the pulse.The number of pulses in a minute, therefore, tells therate at which the heart is beating.. Fig. 40.—a small portion of the capillary network of the web between a frogstoes, as seen with a microscope, a, a small artery feeding the capillaries; r, r/, small veins carrying blood back from the latter. The arrows indicate the direc-tion of the blood-flow. 23. The Capillaries (Fig. 40) are such tiny tubes thatthey cannot be seen without a microscope. Their vastnumber makes up for their small size; in most organs 23. What is said of the size of the capillaries? Of their number?Illustrate. How does the blood do its work while flowing throughithem ? Illustrate. ARTERIAL AND VENOUS-BLdOD VESSEL^. I47 they are so closely packed that a pins point cannot beinserted without wounding some of them. This is illus-trated when the skin is pricked. The blood in it is notlying loose but is flowing in capillaries. We cannot in-sert a needle deeper than the epidermis without wound-ing some of these capillaries and causi

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• bookcentury1800
• bookdecade1
• booksubjectphysiology
• bookyear1884