. Elements of human physiology. Physiology. 212 PHYSIOLOGY a truncated cone open towards the ventricle, are dragged still nearer to the ventricular wall, so that the blood is, as it were, expressed between two cones (heart-wall and valves). At the same time the contraction of the circular fibres at the base of the heart constricts the auriculo-ventricular orifices, so bringing the valves at their origin close together, and enabling their inner surfaces as well as their free edges to be apposed for a considerable extent {v. Fig. 110). The valves being thus closed, the pressure rises higher and
. Elements of human physiology. Physiology. 212 PHYSIOLOGY a truncated cone open towards the ventricle, are dragged still nearer to the ventricular wall, so that the blood is, as it were, expressed between two cones (heart-wall and valves). At the same time the contraction of the circular fibres at the base of the heart constricts the auriculo-ventricular orifices, so bringing the valves at their origin close together, and enabling their inner surfaces as well as their free edges to be apposed for a considerable extent {v. Fig. 110). The valves being thus closed, the pressure rises higher and higher in the ventricle, till it exceeds that in the pulmonary artery. Directly this is the case, the semilunar valves open and allow the ventricle to discharge its contents. The flow of blood from ventricle to artery goes on during the whole systole of Fia. 110 A. Fig. 110 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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