Cardiac Output = Heart Rate×Stroke Volume
CO=HR×SV =75 × 70 =5250(ml)
Cardiac reserve (心力贮备)
CO (Cardiac output) quiet (安静时):5L/min movement (运动时): 180-200 150-170 25-30L/min
Mechanism of AP :
0期: 去极,钠内流(快通道) 1期: 快速复极初期,钾通过瞬时性外向钾外流通
道外流, 膜内电位降至0mv左右
2期: 缓慢复极期又叫平台期,钙和少量钠通过慢 通道的
内流与少量钾外流相持
3期: 快速复极末期,膜对钾的通透性 升高,钾外流 膜电位由0mv 降至-90mv
(自动兴奋的频率)
2.Functional Synplasm(机能合胞体)
Structure basis : Intercalated disc (闰盘) 心肌的机能合体性
The phenomenon of ‘ all or none ’ in the myocardial
(心肌收缩的“全或无”现象)
Sino-artrial node (S-A node, 窦房结) Artrio-ventricular node (A-V node ,房室结) atrioventricular bundle 0.05m/s and bilateral bundles (房室束及左右束支) 2-5m/s
Purkinje fiber(浦肯野氏纤维) 2-5m/s
1.Def. Cardiac cycle (心动周期) : The whole cycle of systole and
diastole (心脏由收缩到舒张的整个过程)