共用题干

共用题干
第一篇

Human Heart can Make New Cells

Solving a longstanding（为时甚久的）mystery, scientists have found that the human heart continues to
generate new cardiac（心脏的）cells throughout the life span, although the rate of new cell production slows
with age.
The finding,published in the April 3rd issue of Science,could open a new path for the treatment of heart
diseases such as heart failure and heart attack,experts say.
"We find that the beating cells in the heart, cardiomyocytes（心肌细胞）,are renewed," said lead
researcher Dr. Jonas Frisen,a professor of stem cell research at the Karolinska Institute in Stockholm,
Sweden."It has previously not been known whether we were limited to the cardiomyocytes we were born with
or whether they could be renewed,"he said.
"The process of renewing these cells changes over time,"Frisen added. In a 20-year-old,about 1
percent of cardiomyocytes are exchanged each year , but the turnover（更替）rate decreases with age to only
0.45 percent by age 75.
"If we can understand how the generation of new cardiomyocytes is regulated,it may be potentially
possible to develop pharmaceuticals（药物）that promote this process to stimulate regeneration after , for
example,a heart attack,"Frisen said.
That could lead to treatment that helps restore damaged hearts.
"A lot of people suffer from chronic heart failure,."noted co-author Dr. Ratan Bhardwaj,also from the
Karolinska Institute."Chronic heart failure arises from heart cells dying," he said.
"With this finding,scientists are opening the door to potential therapies（疗法）,to having ourselves heal
ourselves,"Bhardwaj said."Maybe one could devise a pharmaceutical agent that would make heart cells
make new and more cells to overcome the problem they are facing."
But barriers remain.According to Bhardwaj,scientists do not yet know how to increase heart cell
production to a rate that would replace cells faster than they are dying off,especially in older patients with
heart failure.In addition,the number of new cells the heart produces was estimated using healthy hearts一
whether the rate of cell turnover in diseased hearts is the same remains unknown.

The human heart stops producing cardiac cells ______.
A:when a person becomes old
B:as soon as a person gets sick
C:immediately after a person is born
D:once a person dies