More and More Humans Are Growing an Extra Artery, Showing We're Still Evolving
An anonymous reader quotes a report from ScienceAlert: An artery that temporarily runs down the center of our forearms while we're still in the womb isn't vanishing as often as it used to, according to researchers from Flinders University and the University of Adelaide in Australia. That means there are more adults than ever with what amounts to be an extra channel of vascular tissue flowing under their wrist. "Since the 18th century, anatomists have been studying the prevalence of this artery in adults and our study shows it's clearly increasing," Flinders University anatomist Teghan Lucas said in 2020. "The prevalence was around 10 percent in people born in the mid-1880s compared to 30 percent in those born in the late 20th century, so that's a significant increase in a fairly short period of time, when it comes to evolution." To compare the prevalence of this persistent blood channel, Lucas and colleagues Maciej Henneberg and Jaliya Kumaratilake from the University of Adelaide examined 80 limbs from cadavers, all donated by Australians of European descent. The donors raged from 51 to 101 on passing, which means they were nearly all born in the first half of the 20th century. Noting down how often they found a chunky median artery capable of carrying a good supply of blood, the research team compared the figures with records dug out of a literature search, taking into account tallies that could over-represent the vessel's appearance. Their results were published in 2020 in the Journal of Anatomy. The fact the artery seems to be three times as common in adults today as it was more than a century ago is a startling find that suggests natural selection is favoring those who hold onto this extra bit of bloody supply.
from Slashdot https://ift.tt/3BbfvLs
Read more of this story at Slashdot.
from Slashdot https://ift.tt/3BbfvLs
0 Response to "More and More Humans Are Growing an Extra Artery, Showing We're Still Evolving"
Post a Comment