Why is a cardiopulmonary bypass machine necessary during heart surgery?
A) It's impossible to operate on a beating heart, so the machine has to take over the function of the heart.
B) Otherwise, the heart will stop beating.
C) There will not be enough oxygen getting into the lungs.
D) It isn't always, but it's used to minimize risk.
E) It's not necessary for heart surgery, but it is necessary for surgery involving the lungs.
Correct Answer:
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