《生理学》 CHAPTER 4 CIRCULATI-6.ppt

文档介绍：SECTION 5  ORGAN CIRCULATION 第五节器官循环
The blood flow an denpends on
器官的血流量取决于:
⒈ The difference between aortic pressure and
central venous pressure
主动脉压与中心静脉压之差
⒉ The diastolic and systolic state of blood vessel
in an
该器官阻力血管的舒缩状态
I. Coronary Circulation 冠脉循环
II. Pulmonary Circulation 肺循环
III. Cerebral Circulation 脑循环
I . Coronary Circulation 冠脉循环
左冠状动脉右冠状动脉
供血区域左心室前部左心室后部
和左侧部和右心室

回流途径冠状窦→心前静脉→
右心房右心房
Anatomic consideration
解剖特点
① The boles and branches of left and right coronary
artery often rate myocardium in direction
perpendicular to cardiac surface.
左右冠状动脉主干分支垂直于心脏表面的方向
穿入心肌。
② Myocardial capillary distribution is extremely
abundance .
心肌的毛细血管网分布极为丰富。
③ Collateral coincidence between coronary is less .
冠脉动脉之间的侧支吻合少。
2. Physiological characteristic of coronary circulation
冠脉循环的生理特点
① The pathway is short and blood flow is fast
途径短,血流快
② Blood pressure is high
血压较高
③ Blood flow is big and it is 4%~5% of cardiac output
血流量大,心输出量的4%~5%
④ Arteriovenous oxygen difference is great during silence period
平静时动-静脉血含氧量差很大
⑤ Blood flow fluctuates with cardiac cycle
血流量随心动周期波动
Isovolumic contraction phase ↓↓→ rapid ejection phase ↑→reduced ejection phase ↓→ diastolic phase (isovolumic relaxation phase)
等容收缩期↓↓→快速射血期↑→
减慢射血期↓→舒张期↑(等容舒张期↑↑)