Zusammenfassung
Lavoisier, Chemiker und Vater der wissenschaftlichen Physiologie (1743–1794), verglich Organismen mit einer Flamme: Oxidierende Moleküle betreten sie an ihrer Wurzel und verlassen sie an ihrer Spitze. Die Flamme bleibt dennoch dieselbe, obwohl sie ständig von neuen Substanzen durchflossen wird. Dieser ständige Stoffwechsel mit der Umwelt und innerhalb des eigenen Körpers ist auch ein charakteristisches Merkmal des Lebens. Er ist ein ständiges Nehmen und Geben von chemischen Substanzen und hat dabei zwei Aspekte: den Aufbau eigener Körpersubstanz aus Fremdmaterialien (Baustoffwechsel) und die Bereitstellung von Energie für die Lebensprozesse aus der Oxidation organischer Substanzen (Betriebsstoffwechsel). Den Baustoffwechsel bezeichnet man auch als assimilatorischen Stoffwechsel, da Fremdsubstanz in die eigene Körpersubstanz eingebaut wird. Den Betriebsstoffwechsel bezeichnet man auch als dissimilatorischen Stoffwechsel, da eigene Substanz dem Körper wieder „entfremdet“ wird.
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Sommer, U. (1998). Ökophysiologie II: Ernährung und Stoffwechsel. In: Biologische Meereskunde. Springer-Lehrbuch. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-21673-6_4
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