Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 12-16, 1897

Table of handwritten notes

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            <s xml:id="echoid-s1836" xml:space="preserve">
              <pb o="10" file="0142" n="142"/>
            ſich demnach, wo kommt dieſes Blut her? </s>
            <s xml:id="echoid-s1837" xml:space="preserve">welchen Weg nimmt
              <lb/>
            es vom Herzen bis zu dieſer Stelle, und wie gelangt es wieder
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            von dieſer Stelle zum Herzen zurück?</s>
            <s xml:id="echoid-s1838" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1839" xml:space="preserve">Die Antwort hierauf hat erſt die Wiſſenſchaft der neueren
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            Zeit zu geben vermocht, die mit Hilfe der Mikroſkope den
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            Bau des Körpers genau ſtudiert und namentlich dies Studium
              <lb/>
            auch auf die Körper der Tierwelt ausgedehnt hat, welche in
              <lb/>
            vieler Beziehung beſſere Gelegenheit bietet, um an ihr wiſſen-
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            ſchaftliche Unterſuchungen zu führen. </s>
            <s xml:id="echoid-s1840" xml:space="preserve">Die Antwort hierauf iſt
              <lb/>
            folgende.</s>
            <s xml:id="echoid-s1841" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1842" xml:space="preserve">Von der linken Kammer des Herzens geht eine große
              <lb/>
            Schlagader aus, welche ſich jedesmal, wenn das Herz ſich zu-
              <lb/>
            ſammenzieht, mit Blut anfüllt. </s>
            <s xml:id="echoid-s1843" xml:space="preserve">Dieſe Schlagader teilt ſich
              <lb/>
            dann in zwei Teile, von welchen die eine nach oben, die andere
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            nach unten in den Körper führt. </s>
            <s xml:id="echoid-s1844" xml:space="preserve">Jede dieſer abgezweigten
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            Schlagadern teilt ſich nun wiederum in Zweige, und von
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            jedem Zweig gehen wiederum dünnere Zweige ab. </s>
            <s xml:id="echoid-s1845" xml:space="preserve">Das alles
              <lb/>
            ſind nun geſchloſſene Kanäle, welche Blut führen und mit
              <lb/>
            jedem Zuſammenziehen der linken Herzkammer ſtets eine neue
              <lb/>
            Welle Blut erhalten. </s>
            <s xml:id="echoid-s1846" xml:space="preserve">Nun aber laufen all die immer feiner
              <lb/>
            und feiner werdenden Kanäle in alle Teile und Glieder des
              <lb/>
            Körpers hinein und verbreiten ſich hier in immer feineren
              <lb/>
            Röhrchen, die ſtets dünner und dünner, aber auch in gleichem
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            Maße zahlreicher und verzweigter werden, ſo daß man endlich
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            mit bloßem Auge weder mehr die einzelnen Äderchen noch das
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            Gewebe desſelben ſehen kann. </s>
            <s xml:id="echoid-s1847" xml:space="preserve">Die Verzweigung von Äderchen
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            iſt ſo dicht und gedrängt, daß man in jedem Punkt, den man
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            mit einer Nadelſpitze berührt, auf kleine Äderchen trifft: </s>
            <s xml:id="echoid-s1848" xml:space="preserve">ſticht
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            man demnach mit der Nadel in den Finger, ſo blutet nicht
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            etwa der Finger als ſolcher, ſondern man hat durch den Stich,
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            durch die Verletzung ein kleines Äderchen zerriſſen, worin das
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            Blut, welches vom Herzen herſtrömt, ſeinen Lauf hat. </s>
            <s xml:id="echoid-s1849" xml:space="preserve">In
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            den unverletzten Äderchen war das Blut in den feinen </s>
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