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The interaction begins with a tap on the 'Start' button, which fades out along with the subtitle text. An organic, swirling red and blue fluid animation emerges in the center, representing blood flow. Simultaneously, a 15-second countdown timer fades in at the bottom left. Over the course of 15 seconds, the fluid waves continuously morph, eventually condensing into a concentric circular pulse as the timer reaches zero. The screen then smoothly transitions via a crossfade to reveal the final blood oxygen percentage and a 'Learn More' action button.
