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The word:
Shinpaku 心拍 【しんぱく】 (n) heart rate
Shin/heart is a great kanji to know, but do you recognize the white radical in paku? If you know the radicals, sometimes you can guess the sound, like haku/paku comes from the kanji for white. You'll see a lot of the kanji attributed to haku will have the kanji for white in them since it's the main one