medium · LSAT Reading Comprehension
Engineers have learned to grow new heart-muscle cells in the laboratory. Some commentators conclude that the problem of repairing damaged hearts has therefore been solved. But growing the cells is only the first step: to restore function, the new cells must survive transplantation, align with the existing muscle, and electrically synchronize with it so the heart beats as a unit. None of these later steps has yet been reliably achieved.
The passage suggests that the commentators' conclusion is mistaken primarily because it
- treats accomplishing the initial stage of a multi-stage process as though the entire process had been accomplished
- assumes that laboratory-grown cells are genetically different from the heart's original cells
- relies on evidence drawn from animal hearts that may not apply to human hearts
- presumes that no method other than growing new cells could ever repair a damaged heart
- overlooks that some patients with damaged hearts recover without any medical intervention
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