Blood derived from ying-qi, body fluid and kidney essence. Ying-qi and body fluid are the main material basis and component of blood.

• 血液以水谷之精化生的营气、津液以及肾精为其化生之源。由水谷化生的营气和津液是化生血液主要物质基础,也是血液的主要构成成分。