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Human Circulatory System Crossword Puzzle for High School is a medium crossword puzzle with 19 clues covering . Play it online for free below, or create your own crossword with our free crossword maker.

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Human Circulatory System Crossword Puzzle for High School
Explore key vocabulary of the human circulatory system with this medium-difficulty crossword puzzle. Perfect for 9th-12th graders studying heart anatomy, blood flow, and related concepts.
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Across
  • 1. Circulation loop between the heart and lungs
  • 3. Blood components that help with clotting
  • 4. Protein in red blood cells that carries oxygen
  • 6. Heart valve located between right atrium and ventricle
  • 8. Muscular organ that pumps blood through the body
  • 12. Vessels that carry blood away from the heart
  • 15. Structures that prevent backflow of blood
  • 17. Phase of the heartbeat when the heart muscle contracts
  • 19. Largest artery in the body
Down
  • 2. Heart valve located between left atrium and ventricle
  • 5. Scientific name for red blood cell
  • 7. Tiny blood vessel where gas exchange occurs
  • 9. Phase of the heartbeat when the heart relaxes
  • 10. Lower chambers of the heart that pump blood out
  • 11. Upper chambers of the heart
  • 13. Muscle that aids breathing, helping circulation indirectly
  • 14. Blood vessels that return blood to the heart
  • 16. Circulation loop between the heart and the rest of the body
  • 18. Liquid part of blood that carries cells and nutrients
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