心动周期Cardiac cycle Cardic cycle The cardiac cycle includes two phases:systole and diastole,which forms into one activity cycle. 心房或心室每收缩和舒张一次称心动周期 01.201345060708 收缩期0.3秒 时间(s) Nentricles 心房 舒 contract Atria relax 心室 舒 舒 Atria 房室瓣 开 关 开 contract 半月瓣 关 开 关 Ventricles relax and fill 心音 舒张期0.5秒 Cardic cycle The cardiac cycle includes two phases:systole and diastole ,which forms into one activity cycle. 心房或心室每收缩和舒张一次称心动周期 心动周期 Cardiac cycle