The right atrium receives venous Blood from the superior and inferior venae cavae (see vena cava) and propels it into the pulmonary circulation. The left atrium takes in Blood from the pulmonary veins and sends it into the systemic circulation.

• 心脏右侧从较高和较低的腔静脉获得静脉血,并将之推进肺循环。心脏左侧从肺静脉接获血液,并将之送至体循环。