Elastic fibres in artery walls stretch as blood pressure increases with ventricular contraction and recoil as pressure drops with ventricular relaxation, thus smoothing the blood flow.
Elastic fibres in artery walls stretch as blood pressure increases with ventricular contraction and recoil as pressure drops with ventricular relaxation, thus smoothing the blood flow.
| Front | The elastin fibres in the wall of the artery help to smooth out the flow of blood. What happens to these fibres as the pressure of the blood in the artery changes? (2 mark) |
|---|---|
| Back | Stretch as pressure increases; Recoil/spring back as pressure drops; |
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