Question Constellation Sign up for free AQA · GCSE · Biology · Higher
Stents and Coronary Blood Flow
A doctor decides that the person needs to have a stent fitted.
Explain how a stent works to treat coronary heart disease.
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Marking points
- 1 Explains that the stent opens, widens or keeps the blocked vessel open.
- 2 Links this to greater blood flow or greater oxygen/glucose delivery to the heart.
Full-mark answer
The stent widens and keeps the narrowed blood vessel open, allowing more blood and therefore more oxygen and glucose to reach the heart muscle.
Why this answer loses marks
A stent unblocks the blood vessel.
This does not say that the vessel is widened or held open, or link that change to increased blood flow.