Palpitate v. i. : To beat rapidly and more strongly than usual; to throb; to bound with emotion or exertion; to pulsate violently; to flutter; -- said specifically of the heart when its action is abnormal, as from excitement.

Example:
What exactly is the reason caffeine causes your heart to Palpitate?

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Defination from the web:
palpitate from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "palpitate" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...