Why do men die earlier than women? The latest research makes it known that the reason could be that men’s hearts go into rapid decline when they reach middle age.
The largest study of the effects of ageing on the heart has found that women’s longevity may be linked to the fact that their hearts do not lose their pumping power with age.
“We have found that the power of the male heart falls by 20-25 percent between 18 and 70 years of age,” said the head of the study, David Goldspink of Liverpool John Moores University in the UK.
“Within the heart there are millions of cells that enable it to beat. Between the age of 20 and 70, one-third of those cells die and are not replaced in men,” said Goldspink. “This is part of the ageing process.”
What surprises scientists is that the female heart sees very little loss of these cells. A healthy 70-year-old woman’s heart could perform almost as well as a 20-year-old one’s.
“This gender difference might just explain why women live longer than men,” said Goldspink. They studied more than 250 healthy men and women between the ages of 18 and 80, focusing on healthy persons to remove the confusing influence of disease. “The team has yet to find why ageing takes a greater loss on the male heart,” said Goldspink.
The good news is that men can improve the health of their heart with regular exercise. Goldspink stressed that women also need regular exercise to prevent their leg muscles becoming smaller and weaker as they age. 
The underlined word “longevity” in the second paragraph probably refers to “________”.

[单选题]Why do men die earlier than women? The latest research makes it known that

[单选题]Why do men die earlier than women? The latest research makes it known that

[单选题]Why do men die earlier than women? The latest research makes it known that

[单选题]Why do men die earlier than women? The latest research makes it known that

[单选题]The reason why women and blacks play down their visibility is that they ______.A．) know that someone in authority will reach down and give them a promotionB．) don't want people to think that their promotions were due to sex or colorC．) don't want t

[单选题]Why do women seem less likely to fall in love with the objects themselves?A．) Because they have no visual spatial skills.B．) Because they are only good at language and verbal reasoning.C．) Because they are less likely to see their charming or interes

[单选题]Why do German and French babies produce different types of cries accordingt

[单选题](D)The latest research suggests a more prosaic, democratic, even puritanical view of the world. The key factor separating geniuses from the merely accomplished is not a divine spark. It’s not I.Q., a generally bad predictor of success, even in realms

[单选题]A．ccording to the author, the reason why parental divorce has greater effect on boys than on girls is that_____.［A］ all cultures encourage male aggression and noncompliance［B］ boys are always involved in their parents’ fights［C］ males are usually vie

[单选题]A．ccording to the author, the reason why we go wrong about our friends is that ______.A．)we fall to listen carefully when they talkB．)people tend to be annoyed when we cheek what they sayC．) people usually state one thing hut means anotherD．)we tend