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heartbeat

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heartbeat

Regular contraction and relaxation of the heart, and the accompanying sounds. As blood passes through the heart a double beat is heard. The first is produced by the sudden closure of the valves between the atria and the ventricles. The second, slightly delayed sound, is caused by the closure of the valves found at the entrance to the major arteries leaving the heart. Diseased valves may make unusual sounds, known as heart murmurs.
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? Mentioned in ? References in classic literature
 
While it endures, the temperature falls, the respiration disappears, the heartbeat is indistinguishable--in fact, it IS death, save that it is evanescent.
The Poison Belt by Doyle, Sir Arthur Conan View in context
She lay back that white an' still she might easy be dead; but Miss Polly said she wa'n't dead--an' Miss Polly had oughter know, if any one would--she kept up such a listenin' an' a feelin' for her heartbeats an' her breath
Pollyanna by Porter, Eleanor H. View in context
He stopped beside her, feeling for her pulse and then listening for her heartbeats.
Tarzan of the Apes by Burroughs, Edgar Rice View in context
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