The Chambers of the heart fill to an optimal level and cardiac output increases.

心室逐渐达到理想水平，心脏输出增加。

youdao

Normally the sinoatrial node generates regular electrical pulses that spread across the Chambers of the heart, causing the cells to contract in synchrony.

正常情况下，窦房结产生规律的电脉冲，传入各心房，再带动细胞同步收缩。

youdao

In nature, veins acting as valves are controlling the blood circulation; heart valves control the flow of blood in the Chambers of the heart and maintain the correct pumping action.

在自然界中，静脉作为排气阀控制血液循环，心脏瓣膜控制血液的流量在心室的，保持正确的抽水行动。

youdao

The upper chambers of the heart quiver or beat too fast or too slow.

NPR: Heart Repair Breakthroughs Replace Surgeon's Knife

Lotem said that during the heart catheterization procedure doctors would use a thin plastic tube to insert an "umbrella-like" device that will seal the hole between the two upper chambers of the heart.

CNN: Sharon heart operation set for Thursday

They are designed to help the pumping action of the left ventricle - one of the four chambers that make up the heart.

BBC: Image of heart failure