Nervenzelle aus der Hirnrinde einer Ratte mit unmyelinisiertem Axon. Aktionspotenziale (AP) laufen entlang des dünnen Zellfortsatzes (Axon, weiße Pfeile) und können dort mit einer Messelektrode gemessen werden (links oben). Überlagerte Kurven Bildmitte: Ein Aktionspotenzial (weiß) beruht auf einem Natrium-Einstrom (INa, rot) und einem Kalium-Ausstrom (IK, blau). Die zeitliche Überlappung der beiden Ströme (gelbe Fläche) bestimmt die Energieeffizienz: Je kleiner der Anteil der gelben an der rot umrandeten Fläche (Gesamtmenge der einströmenden Natrium-Ionen) ist, desto höher ist die Effizienz
Source: H. Alle, J. R. P. Geiger
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