The heart pumps too little blood with each beat, and although it tries to compensate by increasing its pumping rate, it cannot do enough: blood pressure falls, and nourishment does not reach the tissues.

• 在这种状况下，心脏每次唧打出去的血量过少；虽说心脏会因此而增加心跳频率来弥补，但还是不够，所以血压下降，养份也无法送达组织。