All about the heart and blood vessels! The heart 5.0 / 5 based on 2 ratings ? BiologyHuman, animal and plant physiologyASEdexcel Created by: smudgeacornCreated on: 04-04-14 17:00 253167 Across 1. If there is higher pressure behind a valve, is it forced open or shut? (4) 2. Do arteries have thick or thin muscle layer? (5) 5. If there is higher pressure in front of a valve, is it forced open or shut? (4) 6. Do veins have a thick or thin muscle wall? (4) 7. What are the networks of capillaries in tissues called? (9, 4) Down 2. Why are capillary walls (endothelium) only one cell thick? (2, 5, 2, 9) 3. Which has a larger lumen - arteries or veins? (5)
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