So much so that the volume of blood being pumped with each heartbeat can return to normal levels.

这样可使每次心跳带动的血液回到正常水平。

This is also called cardiac output, and it's determined by the blood volume pumped during one beat, and the number of beats per minute.

这也被称为心输出量，它是由一次跳动中泵出的血量决定的，每分钟跳动的次数。

Cardiac output equals the number of heartbeats per minute times the volume of blood pumped out of the ventricles with each heartbeat.

心输出量等于每分钟心跳次数乘以每次心跳从心室泵出的血液量。