论文部分内容阅读
心脏是一具有弹性的肌性器官。当其收缩时,一方面把心腔内血液射入动脉,另一方面又使心脏发生“压缩性”形变;主动收缩一停止,心脏就在这种“压缩性”形变后所具有的回弹力即舒张力作用下而迅速发生舒张过程。心脏舒张时,心腔由小增大,处于密闭状态的心腔内压急剧降低,这就造成心腔内压低于静脉内压的状况,一种对静脉血液的抽吸引力——舒张吸力也就由此而产生。舒张吸力是促使静脉回心的主要动力。可见,心脏通过其有节律性的舒缩活动,不断地将血液从静脉中抽吸回心再射入动脉,起着“泵”的作用,推动血液循环。
The heart is a flexible muscular organ. When its contraction, on the one hand the intra-arterial blood into the heart, on the other hand the heart and then make the heart “compression” deformation; active contraction of a stop, the heart in this “compressive” after the deformation has the resilience That is, diastolic and rapid diastolic process. Cardiac diastole, the heart chamber increased from small, closed in a sharp decrease in intracardiac pressure, which resulted in intracardiac pressure below the venous pressure, a kind of suction on the venous blood suction - diastolic suction also Resulting from this. Diastolic suction is the main motivation to promote venous return. Can be seen, the heart through its rhythmic contraction and contraction activities, and constantly pumping blood from the vein back into the heart and then injected into the artery, plays a “pump” role in promoting blood circulation.