| Front | The thickness of the aorta wall changes all the time during each cardiac cycle. Explain why ( 3 marks) |
|---|---|
| Back | (Aorta wall) stretches; Because ventricle / heart contracts / systole / pressure increases; (Aorta wall) recoils; Because ventricle relaxes / heart relaxes / diastole / pressure falls; Maintain smooth flow / pressure; |
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