檢視下肢的静脉的原始碼

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[[File:U=3664395404,2859059551&fm=15&gp=0.jpg|缩略图|居中|[https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3664395404,2859059551&fm=15&gp=0.jpg 原图链接][https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E4%B8%8B%E8%82%A2%E7%9A%84%E9%9D%99%E8%84%89&step_word=&hs=0&pn=9&spn=0&di=38290&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3664395404%2C2859059551&os=3569519268%2C3107664526&simid=4083470316%2C873480686&adpicid=0&lpn=0&ln=710&fr=&fmq=1608435730594_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined&copyright=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=15&oriquery=&objurl=https%3A%2F%2Ftimgsa.baidu.com%2Ftimg%3Fimage%26quality%3D80%26size%3Db9999_10000%26sec%3D1608445880715%26di%3D6f2b1b43ca05c3c5cae05f98cd86f569%26imgtype%3D0%26src%3Dhttp%3A%2F%2Fimg.yao51.com%2Fjiankangtuku%2Fkmfmqqwfy.jpeg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fyw5c8_z%26e3Bv54AzdH3F3twghwg2p7h7AzdH3Futruutiz_z%26e3Bip4s&gsm=a&rpstart=0&rpnum=0&islist=&querylist=&force=undefined来自 百度 的图片]]]

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下肢静脉是指人体下肢的血管，分为深、浅两组，以及深、浅静脉之间的下肢交通静脉和下肢肌肉静脉。浅静脉最终会汇入深静脉。人体静脉血管的生理功能，就在于保证[[静脉血液]]由远而近的向心流动。

下肢肌肉收缩是促使静脉血液向心流动的重要条件。在收缩时静脉瓣膜开放，穿通支静脉瓣膜关闭，推动[[血液]]向心流动；当肌肉松弛时，静脉瓣膜出现相反现象，浅静脉血液向深静脉流动。所以，肌肉收缩是血液回流的动力，而正常瓣膜是血液回流的条件。所以，下肢静脉又被称为“第二心脏”。