Which statement about coronary by-pass surgery is correct?
It is carried out to reduce the effects of atherosclerosis, improving the delivery of oxygen and dissolved glucose to the cardiac muscle of the heart.
2 )
It is the surgical removal of one or more coronary arteries to reduce the strain on the heart of a person with coronary heart disease.
3 )
Surgeons are able to divert blood around the diseased sections of the coronary arteries so that more oxygenated blood can be pumped round the systemic circulation.
4 )
The diseased parts of the aorta are replaced by using a section of a main artery from elsewhere in the body of the same person, to avoid rejection.
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