So when the atria contract, the valves sandwiched between the atria and the ventricles open, and the blood in each atrium flows through its respective valve down into a ventricle.
所以当你的心房收缩时，夹在心房和心室之间的阀门就打开了，然后每个心房里的血液通过各自的阀门流向心室。
So when the atria contract, the valves sandwiched between the atria and the ventricles open, and the blood in each atrium flows through its respective valve down into a ventricle.
所以当你的心房收缩时，夹在心房和心室之间的阀门就打开了，然后每个心房里的血液通过各自的阀门流向心室。
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