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人的心脏好比是水泵,将血液不断地泵动,让血液流向全身各处;血管好比是连接抽水机的胶管,血液在血管里流动。血压,就是从心脏泵出的血流对动脉血管壁所产生的侧压力。通常以上肢肱动脉处测得的动脉压力来代表。血压的高低以毫米汞柱(或千帕)来表示。心脏跳动时有收缩与舒张两个过程,所以血压分为收缩压和舒张压两种。
The human heart is like a water pump, pumping blood continuously and letting the blood flow throughout the body. The blood vessel is like a hose that connects the water pump, and the blood flows in the blood vessel. Blood pressure is the side pressure exerted on the wall of the arterial wall by the blood flow pumped from the heart. It is usually represented by the measured arterial pressure at the brachial artery of the upper extremity. The level of blood pressure is expressed in millimeters of mercury (or kPa). Heart beat when there are two processes of contraction and relaxation, so the blood pressure is divided into two kinds of systolic and diastolic blood pressure.