血液

1. Origins, structure, and basic meaning

• Structure: 血液, read けつえき, means the blood circulating through the body.
• Basic usage: It is used for collecting blood for testing or describing the heart's role in pumping blood.
  • 検査のために少量の血液を採取した。

2. Common pitfalls and similar expressions

• Context compared with 血
  • 血(ち) is the everyday word for blood, while 血液 often appears in explanations of testing or bodily functions.