采用大多数给药途径给药(静脉注射除外)的药物在进入体循环之前必须通过数层半渗透性细胞膜。
When given by most routes (excluding iv), a drug must traverse several semipermeable cell membranes before reaching the systemic circulation.
心脏左侧从肺静脉接获血液，并将之送至体循环。
The left atrium takes in Blood from the pulmonary veins and sends it into the systemic circulation.
这是一个十分罕见的“反常栓子”(请看本图左边)，之所以这样称呼是因为这种在静脉循环中出现的血栓会栓塞于体循环。
This is a "paradoxical embolus", rare (seen on the left here), and so called because a thromboembolus arising from the venous circulation can end in the systemic circulation.
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