By Y. C. Fung
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The x wave is due to downward displacement of the base of the ventricles during systole and continued atrial relaxat ion. The x v wave is due to filling of the right atrium. The vy wave follows the opening of the tricuspid valve. ) is essentially the same as the juglar vein pulse. The volume curve of the left ventricle shows an a wave due to the contraction of the left atrium, followed by an isovolumic period of ventricular contraction. As the aortic valve opens , blood is ejected into the aorta and the left ventricular volume is rapidly decreased .
153, by permission. triscuspid valves are attached to papillary muscles, which contract in systole, pull down the valves to generate systolic pressure rapidly, and prevent the valves from any dang er of inversion into the atrium. The aortic and pulmonary valves have no strings attached. The closing and open ing of all valves are operated by blood itself through hydrodynamic forces. The heart is a muscle. The muscles of the atri a and the ventricles are joined to a skeleton of fibrous tissue on which the rings of the four valves are seated .
Th e arteries in G reco -Ro man medicine. In Str ucture and Function of the Circulation (Schwa rtz , C. , Werthessen , N. , Plenum Press, New Yo rk. 1 Introduction The heart is the prime mover of blood . By periodic stimulation of its muscles it contracts periodically and pumps blood throughout the body. How the pump works is the subject of this chapter. In each cycle the left and right ventricles are first filled with blood from the left and right atria, respectively, in the diastolic phase of the cycle.