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GALLERY: Human Heart Rate

Heart rate is the speed of the heartbeat measured by the number of contractions (beats) of the heart per minute (bpm). The heart rate can vary according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide . It is usually equal or close to the pulse measured at any peripheral point. Activities that can provoke change include physical exercise , sleep , anxiety , stress , illness , and ingestion of drugs .

Heart rate, also known as pulse, is the number of times a person's heart beats per minute. Normal heart rate varies from person to person, but a normal range for adults is 60 to 100 beats per minute, according to the Mayo Clinic.

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