From the left atrium the blood passes through the bicuspid valve into the left ventricle. 来自左心房的血液通过二尖瓣进入右心室。
Degenerative mitral valve disease is a common cause of congestive heart failure in dogs, especially small, older dogs. 退行性二尖瓣病变是引起犬只充血性心力衰竭的常见病因,尤其是小型犬和老年犬。