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血液循环血液循环包括心脏和血管两部分。关于心脏的结构和功能,请参阅本刊今年第二期第三十九页,这里不再重复。下面着重谈谈血管的结构和功能。
Blood circulation Blood circulation includes the heart and blood vessels in two parts. For the structure and function of the heart, please refer to the thirty-ninth page of this issue of the second issue of this year, which will not be repeated here. The following focuses on the structure and function of blood vessels.