肺循环
肺循环静脉血自右心室进入肺动脉,经肺动脉各级分支,进行气体交换后,含氧丰富的动脉血经肺静脉流回左心房。此循环途径称为肺循环。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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