血

1. Origins, structure, and basic meaning

• Structure: 血 is read ち as a standalone word and means blood.
• Basic usage: In 指を切って血が出たので、すぐに傷口を洗った。, the speaker cut a finger, bled, and immediately washed the wound.

2. Common pitfalls and similar expressions

• Word-dependent reading
  • Standalone 血 is ち, while 血液 is けつえき. The everyday standalone word for blood is not read けつ.
• Bleeding and drawing blood
  • 血が出る describes bleeding; 血を採る describes taking blood for testing. In the testing context, 採る does not describe blood flowing out on its own.