desecribe the function of atria,ventricles,valves,and the septum in the human heart.科学

desecribe the function of atria,ventricles,valves,and the septum in the human heart.科学
desecribe the function of atria,ventricles,valves,and the septum in the human heart.
科学

desecribe the function of atria,ventricles,valves,and the septum in the human heart.科学
解释心房、心室、瓣膜和隔膜在人体心脏中的作用.