DNA and RNA are key to this puzzle that helps middle schoolers review basic protein synthesis terms like 'codon' and 'enzyme' with clear, simple clues.
Human Circulatory System Crossword Puzzle for ESL Learners is a hard crossword puzzle with 9 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 ESL Learners
Challenge advanced ESL learners with this hard difficulty puzzle focused on the human circulatory system. Master technical terms and specialized vocabulary related to blood flow and heart anatomy.
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Across
- 1. Thin layer of cells lining the interior surface of vessels
- 2. Red blood cell responsible for oxygen transport
- 6. Microscopic blood vessel where exchange with tissues occurs
Down
- 3. Cell fragment essential for blood clotting; also called platelet
- 4. Phase of the cardiac cycle when the heart contracts
- 5. Oxygen-binding protein in red blood cells
- 7. Muscular middle layer of the heart wall responsible for contraction
- 8. Small vessel that collects blood from capillaries
- 9. Adjective describing the major artery leaving the heart
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