N any of the small branches of a vein that receives oxygen-depleted blood from the capillaries and returns it to the heart via the venous system 小静脉 [anatomy]
Capillary: One of the minute blood vessels that connect arterioles and venules.
毛细管：连接动脉和小静脉的纤细的血管中的一条。
The muscular venules consisted of a few layers of smooth muscle cells in circle arrangement.
肌性微静脉的中膜由几层环形排列的平滑肌细胞构成。
Capillaries rejoin into larger venules , which unite to form veins, which carry blood back to the heart.
完成了物质交换的脱氧血从毛细血管汇入小静脉，然后再经由大静脉返回心脏。
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