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

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          <p>
            <s xml:id="echoid-s1228" xml:space="preserve">
              <pb o="88" file="0096" n="96"/>
            von allem Übrigen ganz abſehen; </s>
            <s xml:id="echoid-s1229" xml:space="preserve">und deshalb wollen wir
              <lb/>
            uns auch vorerſt vorſtellen, daß die Lunge allein den ganzen
              <lb/>
            Raum einnimmt, um unſere Aufmerkſamkeit beſſer auf den
              <lb/>
            Mechanismus des Atmens richten zu können.</s>
            <s xml:id="echoid-s1230" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1231" xml:space="preserve">Das Atmen geſchieht nun in folgender Weiſe.</s>
            <s xml:id="echoid-s1232" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1233" xml:space="preserve">Das Zwerchfell, welches die Scheidewand zwiſchen Bauch-
              <lb/>
            und Bruſthöhle bildet, zieht ſich durch eine eigene Kraft, von
              <lb/>
            der wir noch ſprechen werden, zuſammen. </s>
            <s xml:id="echoid-s1234" xml:space="preserve">Dadurch wird der
              <lb/>
            Raum der Bauchhöhle verengt und der Raum der Bruſthöhle
              <lb/>
            in gleichem Grade vergrößert; </s>
            <s xml:id="echoid-s1235" xml:space="preserve">zu gleicher Zeit dehuen ſich die
              <lb/>
            Seitenwände des Bruſtkaſtens, die Rippen, und erweitern gleich-
              <lb/>
            falls die innere Höhlung. </s>
            <s xml:id="echoid-s1236" xml:space="preserve">Dadurch entſteht rings um die Lungen
              <lb/>
            ein leerer Raum. </s>
            <s xml:id="echoid-s1237" xml:space="preserve">Da nun die Lunge hohl iſt, und ein hohles Rohr
              <lb/>
            von ihr bis in die Mundhöhle hinauf geht, woſelbſt durch
              <lb/>
            Mund und Naſe Luft eindringen kann, ſo ſtrömt die Luft
              <lb/>
            von außen in die Lunge hinein und dehnt dieſe ſo aus, daß
              <lb/>
            ſie den ganzen erweiterten Raum des Bruſtkaſtens ausfüllt.
              <lb/>
            </s>
            <s xml:id="echoid-s1238" xml:space="preserve">Dies nennt man das Einatmen der Luft in die Lunge.</s>
            <s xml:id="echoid-s1239" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1240" xml:space="preserve">Sobald dies geſchehen, läßt die Kraft, welche das Zwerch-
              <lb/>
            fell nach unten hin geſenkt hatte, nach; </s>
            <s xml:id="echoid-s1241" xml:space="preserve">zu gleicher Zeit er-
              <lb/>
            ſchlaffen auch die Rippenwände des Bruſtkaſtens und ſinken
              <lb/>
            wieder in ihre natürliche Lage zuſammen. </s>
            <s xml:id="echoid-s1242" xml:space="preserve">Hierdurch wird
              <lb/>
            der innere Raum des Bruſtkaſtens wieder verengt, die aus-
              <lb/>
            gedehnte, mit Luft angefüllte Lunge hat nicht Platz und wird
              <lb/>
            zuſammengedrückt. </s>
            <s xml:id="echoid-s1243" xml:space="preserve">So muß denn die Luft wieder durch die
              <lb/>
            Röhre, die Mundhöhle, und ſie ſtrömt denn auch wirklich
              <lb/>
            durch Mund oder Naſe hinaus in die Welt. </s>
            <s xml:id="echoid-s1244" xml:space="preserve">— Dies nennt
              <lb/>
            man das Ausatmen.</s>
            <s xml:id="echoid-s1245" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s1246" xml:space="preserve">Im eigentlichen Sinne iſt es demnach nicht die Lunge,
              <lb/>
            welche beim Atmen die Arbeit verrichtet, ſondern das Zwerch-
              <lb/>
            fell und der Bruſtkaſten ſind es, welche den Raum um die
              <lb/>
            Lunge erweitern; </s>
            <s xml:id="echoid-s1247" xml:space="preserve">und der Druck der Luft, welche die Erde
              <lb/>
            umgiebt und ſchwer wie jedes Ding auf der Erde laſtet, </s>
          </p>
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