It is initiated by the contraction of the ventricles of the heart. Figure 1914 Blood Flow from the Left Ventricle into the Great Vessels a A transverse section through the heart illustrates the four heart valves during ventricular contraction.
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The atria and vessels have been removed.
. Blood flow refers to the movement of blood through a vessel tissue or organ and is usually expressed in terms of volume of blood per unit of time. B A frontal view shows the closed mitral bicuspid valve that prevents. The two atrioventricular valves are closed but the two semilunar valves are open.
Ventricular contraction ejects blood into the major arteries resulting in flow from regions of higher pressure to regions of lower pressure as blood encounters smaller.
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