Physical Education Crossword Revision 0.0 / 5 ? Physical EducationCardiovascular systemGCSEAQA Created by: NathansurgeCreated on: 06-11-18 21:44 726543189 Across 1. diffusion of oxygen happens in to the blood stream (7, 8) 5. when the heart is resting (8) 8. increasing the diameter of small arteries increase blood flow to tissue (12) 9. reducing the diameter of small arteries to reduce blood flow to tissue (16) Down 2. working muscles (12) 3. prevents backflow in vein (6) 4. lower half of the heart (9) 6. top half of the heart (5, 3, 4, 7) 7. when the heart is contracting (7)
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