Heart and Cardiac cycle 5.0 / 5 based on 1 rating ? BiologyHuman, animal and plant physiologyTopic 1ASEdexcel Created by: horsewithnonameCreated on: 23-05-16 09:42 627851349 Across 1. The smallest blood vessels, where metabolic exchange occurs (11) 4. These carry blood to the heart (5) 5. These chambers have less muscular walls as they only have to pump blood inside the heart (5) 9. When the ventricles contract and the blood is forced into the aorta/pulmonary artery (11, 7) Down 2. These stop blood flowing back into the heart (9, 6) 3. These carry blood away from the heart (8) 6. This chamber has the thickest and most muscular walls (4, 9) 7. When the atria contract and the blood is forced into the ventricles (6, 7) 8. When the whole heart is relaxed and blood starts to return to the atria (7, 8)
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