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  1. Blood - Wikipedia

  2. Blood | Definition, Composition, & Functions | Britannica

  3. Blood: Function, What It Is & Why We Need It - Cleveland Clinic

  4. Components of blood (article) | Khan Academy

  5. Facts About Blood | Johns Hopkins Medicine

  6. Blood: Components, functions, groups, and disorders - Medical News Today

  7. 18.1 An Overview of Blood - Anatomy and Physiology 2e

  8. Blood: Composition, components and function | Kenhub

  9. Blood | MedlinePlus

  10. Quick Facts:Overview of Blood - MSD Manual Consumer Version