静脈

1. Origins, structure, and basic meaning

• Structure: 静脈 (じょうみゃく) is an anatomical noun for a blood vessel that returns blood toward the heart.
• Basic usage: 腕の静脈を確かめる makes a vessel selected for drawing blood the object, while 静脈は血液を戻す makes the vessel type the topic of its general function.

2. Common pitfalls and similar expressions

• Specific vessel and class function
  • 腕の静脈 identifies a vessel by body location, whereas 静脈は generalizes over the vessel class. Its direction should not be reversed into the outward flow associated with arteries.