英语语法分析

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。