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Beginning of Paper
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Heart Cells
Crooners who lament that broken hearts never mend may need to find another tune. Scientist are finding new evidence that suggests that, contrary to scientific consensus, heart muscle cells do divide and the number of cells can increase.
The vast majority of heart muscle cells, or myocytes, had been thought to stop dividing by the time a person reaches the age of 9. These cells then pump blood for the r ....
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Middle of Paper
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.... stained slices of heart tissue half a micrometer thick and used a confocal microscope to count the individual cell nuclei caught in the process of division. Judging from these samples, They found that a estimate of 131 to 152 myocytes in every million were dividing.
That proportion suggests that the cells of a damaged ventricle could be replaced within a year, the researchers calculate. However, many heart-attack victims do not recover their pr ....
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