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Author: Athur

How to recharge in COTK

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福彩七乐彩预测投注 于是将暗红色的静脉血,变为鲜红色的动脉血(含氧多,二氧化碳少),经由各级肺静脉,最后注入左心房。极速飞艇开奖直播 如上路径的血液循环称肺循环,又称为小循环。肺循环的特点是路程短,只通过肺,主要是使静脉血转变成含氧丰富的动脉血。冠脉循环是为了给心脏自身提供其所需英国乐透8预测开奖 要的营养物质和氧并运走废物的。是血液直接由主动脉基部的冠状动脉流向心肌内部的毛细血管网最后由静脉流回右心房的一种循环。血液循环的主要意义

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