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 479631258 Across 1. When the atria contract and the blood is forced into the ventricles (6, 7) 5. These carry blood away from the heart (8) 8. This chamber has the thickest and most muscular walls (4, 9) Down 2. These chambers have less muscular walls as they only have to pump blood inside the heart (5) 3. These carry blood to the heart (5) 4. When the ventricles contract and the blood is forced into the aorta/pulmonary artery (11, 7) 6. These stop blood flowing back into the heart (9, 6) 7. The smallest blood vessels, where metabolic exchange occurs (11) 9. When the whole heart is relaxed and blood starts to return to the atria (7, 8)
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