This easy crossword puzzle helps kids in grades 3-5 learn about protein synthesis and DNA basics with common words and simple clues.
Hard Human Circulatory System Crossword Puzzle for Kids is a hard crossword puzzle with 13 clues covering . Play it online for free below, or create your own crossword with our free crossword maker.
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Hard Human Circulatory System Crossword Puzzle for Kids
Challenge your knowledge with this hard difficulty circulatory system crossword tailored for kids ages 8–12. Explore advanced terms related to heart, blood vessels, and circulation.
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Across
- 2. Tiny blood vessels where exchange of oxygen and nutrients occurs
- 3. Phase of the heartbeat when the heart muscle contracts
- 4. Muscular middle layer of the heart wall responsible for contractions
- 5. Phase of the heartbeat when the heart muscle relaxes
- 6. Iron-containing protein in red blood cells transporting oxygen
- 8. Protective sac enclosing the heart
- 13. Upper chamber of the heart that receives blood
Down
- 1. Heart chamber that pumps blood out to the body or lungs
- 7. Small branch of an artery leading to capillaries
- 9. Inner lining layer of blood vessels composed of flat cells
- 10. Relating to the valves that prevent blood backflow in the heart
- 11. Relating to the lungs and the circulation between heart and lungs
- 12. Fluid component of blood carrying cells and nutrients
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