...over-distended arteries effects the closure of the semilunar valves, and the whole cycle recommences. Sounds of the heart. — When the ear is applied to the chest, over the region of the heart, two sounds are heard ; one dull and prolonged, which is the first sound...

...and hence, by the mediastiual attachments of the pericardium, draws the chest-wall after it. § 130. The Sounds of the Heart. When the ear is applied to...the interval of time is very short, too short to be easily measured, but between the second and the succeeding first sound there is a distinct pause. The...

...hang upon a single thread many of the most important of the physical phenomena of the circulation. The Sounds of the Heart. — When the ear is applied to the chest, or to a stethoscope placed over the cardiac region, two sounds are heard with every beat of the heart...

...certain sounds are heard, which recur with great regularity. The first sound is a comparatively long, booming sound; the second, a short, sharp, sudden...; but, between the second and the succeeding first sounds there is a distinct pause. The first sound is generally supposed to be caused by the contraction...