心脏不断跳动,促使血液循环以维持机体生存。当心室收缩时,左心室的血液射入主动脉,流到颈动脉,股动脉和肝、肾等动脉。右心室的血液射入肺动脉;与此同时,血管内的压力增加,血管扩张。心室舒张时、动脉瓣关闭,血管回缩。各动脉的这种扩张和收缩变化是有节奏和有规律的,而当脏器有病,使外周阻力增大,血管顺应性变差 Heart constantly beating, prompting blood circulation to maintain the body’s survival. When ventricular contraction, the left ventricular blood into the aorta, flow to the carotid artery, femoral artery and liver, kidney and other arteries. Right ventricular blood into the pulmonary artery; at the same time, intravascular pressure increases, vasodilation. Ventricular diastolic, aortic valve closure, vascular retraction. This expansion of arteries and contraction changes are rhythmic and regular, and when the organ is sick, so that increased peripheral resistance, poor vascular compliance