QUESTION 19 In the graphs below, the light gray lines indicate a "normal" heart rate. In which graph, does the colored line indicate a SLOWER heart rate as compared to the normal heart rate? C A A B 20- 0- -20 -40- -60- 20 MAMA 0.8 1.6 Time (sec) (b) 0.8 1.6 Time (sec).

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