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Human Circulatory System Crossword Puzzle for Middle School is a hard crossword puzzle with 8 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 Middle School
Challenge yourself with this hard difficulty crossword focused on the human circulatory system. Perfect for middle schoolers to learn advanced cardiology and blood vessel terms.
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Across
  • 1. Innermost cellular lining of blood vessels
  • 3. Microscopic blood vessels where gas and nutrient exchange occur
  • 4. Circulation pathway between the heart and lungs
Down
  • 2. Small veins that collect blood from capillaries
  • 5. Type of heart valve located between atria and ventricles
  • 6. The thick muscular layer of the heart responsible for contraction
  • 7. Arteries supplying blood directly to the heart muscle
  • 8. Phase of the cardiac cycle when the heart contracts
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