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This contraction pushes blood through the tricuspid and mitral valves into the resting lower chambers the right and left ventricles. The second part of the pumping phase begins when the ventricles are full of blood. The electrical signals from the SA node travel along a pathway of cells to the ventricles, causing them to contract.

This is called systole. As the tricuspid and mitral valves shut tight to prevent a back flow of blood, the pulmonary and aortic valves are pushed open. While blood is pushed from the right ventricle into the lungs to pick up oxygen, oxygen-rich blood flows from the left ventricle to the heart and other parts of the body.

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After blood moves into the pulmonary artery and the aorta, the ventricles relax, and the pulmonary and aortic valves close. The lower pressure in the ventricles causes the tricuspid and mitral valves to open, and the cycle begins again. This series of contractions is repeated over and over again, increasing during times of exertion and decreasing while you are at rest.

It's a plane? No, I'm really asking. What is it? Can you spell these 10 commonly misspelled words? Definition of heartbeat.

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Synonyms Example Sentences Learn More about heartbeat. Synonyms for heartbeat Synonyms beat , eyeblink , flash , instant , jiff , jiffy , minute , moment , nanosecond , New York minute , second , shake , split second , trice , twinkle , twinkling , wink Visit the Thesaurus for More.

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Examples of heartbeat in a Sentence The patient had a rapid heartbeat. I'd accept a job offer from that company in a heartbeat. Recent Examples on the Web When doctors need a patient to breathe in a rhythmic pattern, the duck can emit a series of pulses, designed to mimic a heartbeat , that can help to calm a child and guide their breathing. Now a robotic duck is doing it for them. First Known Use of heartbeat , in the meaning defined at sense 1.

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Learn More about heartbeat. Resources for heartbeat Time Traveler! Explore the year a word first appeared.

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Dictionary Entries near heartbeat heart and soul heart attack heart balm heartbeat heart block heart bond heartbreak. Phrases Related to heartbeat in a heartbeat.

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Time Traveler for heartbeat The first known use of heartbeat was in See more words from the same year. English Language Learners Definition of heartbeat. Kids Definition of heartbeat. Comments on heartbeat What made you want to look up heartbeat? Get Word of the Day daily email!

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