(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 5. Directional change of heartbeat, analyzed by the metachrony along five
sensor sites in D. melanogaster (female 2). (A) Transition from
anterograde to retrograde beating. Arrowheads indicate double peaks during
diastole. (B) Transition from retrograde to anterograde beating. The first
anterograde pulse collides with a retrograde pulse at the anterior sensor
point (asterisk). Explanations as in Fig.
4.