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Noun(1) a leading instance in its field(2) a specialized bit of heart tissue that controls the heartbeat(3) an implanted electronic device that takes over the function of the natural cardiac pacemaker(4) a horse used to set the pace in racing

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(1) Sinus dysrhythmia refers to a malfunction of the sinus node, the heart's natural pacemaker .(2) The sinus node is a natural pacemaker in your heart that helps your heart beat steadily.(3) the brain's circadian pacemaker which regulates our u2018biological clocku2019(4) Our own internal pacemaker tunes our mental and physical energy levels more or less to the cycles of sunlight.(5) That is some record for a horse used primarily in those races as a pacemaker .(6) he acted as a pacemaker for Bannister when he broke the four-minute mile(7) Ridden by Kieren Fallon, the two-year-old took up the lead from pacemaker Hills of Aran halfway through the one mile race.(8) In 1998 the journal Science published a report that indicated that light exposure to the back of the knee may reset the human circadian pacemaker .(9) Toffan and McCaffery had entered Bosque Redondo mainly to serve as a pacemaker for stablemate Came Home, who wound up winning the race.(10) On the third lap his pacemaker moved aside as El Guerrouj put in a 55-second lap.(11) Context.-Interstitial cells of Cajal are pacemaker cells in the smooth muscles of the gut.(12) For this reason, the researchers decided to examine the output of the body's internal clock, called the circadian pacemaker .(13) The classical concept of the source of cardiac rhythm is that it originates from the sino-atrial node, the heart's natural pacemaker located on top of the right atrium.(14) The tactics for the race were thrown into confusion when the scheduled pacemaker Newton was left standing at the start.(15) This node is called the pacemaker of the heart because it sets the rate of the heartbeat and causes the rest of the heart to contract in its rhythm.(16) We put a pacemaker in there just to make sure it was a strong pace and he had everybody beaten.