|Ever wonder how dogs can walk barefoot in the snow?|
Ever wonder how dogs can walk barefoot in the snow? Now a Japanese scientist may have the answer -- an internal central heating system, Reuters reported.
The secret lies in how dogs circulate their blood to prevent cold surfaces from chilling the rest of their bodies, according to Hiroyoshi Ninomiya, a professor at Yamazaki Gakuen University.
The system uses warm, oxygenated blood to heat the cold blood that has been in contact with a cold surface before returning it to the dog's heart and central circulation.
Dogs are not alone in having this sort of heat exchange system, which is shared by other animals such as dolphins, Ninomiya said. （点击路透社网站查看原文）
(China.org.cn March 8, 2012)