檢視下肢静脉的原始碼

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| style="background: #008080" align= center|  '''<big>下肢静脉</big> '''

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[[File:U=515995702,769796657&fm=26&gp=0.jpg|缩略图|居中|[https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=515995702,769796657&fm=26&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%E9%9D%99%E8%84%89&step_word=&hs=0&pn=1&spn=0&di=48620&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=515995702%2C769796657&os=3230418443%2C2825088413&simid=3449654414%2C519084192&adpicid=0&lpn=0&ln=1114&fr=&fmq=1608355308310_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=0&oriquery=&objurl=https%3A%2F%2Ftimgsa.baidu.com%2Ftimg%3Fimage%26quality%3D80%26size%3Db9999_10000%26sec%3D1608365397926%26di%3Da7cfdce5bd04b8f02a4c1465d4f35436%26imgtype%3D0%26src%3Dhttp%3A%2F%2Fimg.yao51.com%2Fjiankangtuku%2Fdlklmmncv.jpeg&fromurl=ippr_z2C%24qAzdH3FAzdH3Fyw5c8_z%26e3Bv54AzdH3F3twghwg2p7h7AzdH3Futruutiz_z%26e3Bip4s&gsm=2&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”。