The Sounds of the Heart.
ON applying the ear to the chest just over the heart, two sounds are heard. The first one is dull and slightly prolonged; the second is a shorter and smarter sound, having a sort of clack. These occur in pretty rapid succession, and then comes a brief interval. And this round of action, first a long and dull sound, then a short and smart one, and then an interval, called the heart's rhythm, is repeated continually. If the space of time occupied by the rhythm be divided into five parts, the first sound will take about two parts, the second one, and the interval of repose, the remaining two. The first sound is heard about the time of the contraction of the ventricles, and is therefore called the systolic sound; the second is synchronous with the opening of the ventricles, and is called the diastolic sound. The syllables too to too to, very fairly represent the two sounds of the heart. These sounds are heard over the largest space in lean persons.
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