According to Mehr news agency, citing Science alertimagining how the species of creatures in the distant future will look like mayarrivemakes strange speculations about people’s salient features, including height, brain size, and skin color. However, the changes in the anatomy of the human body show how unpredictable evolution is.
Consider something as simple as an extra vein in the arm, which given current trends has probably been common for several generations. For example, based on a study by university researchers Flinders And the University of Adelaide, Australia did it in 2020 arethe artery that temporarily runs down the center of our forearm during fetal life doesn’t disappear as often as it used to.
That means more adults than ever have what appears to be an extra channel of vascular tissue running beneath their wrists. Tegan University researcher Lucas Flinders in this load In 2020, he said: Anatomists have been investigating the connection of this vein in adults since the 18th century are And research shows this is on the rise. The prevalence of this in the mid-1880s included about 10% of newborns. However, this index reached 30% in the 20th century, so from an evolutionary point of view, such a trend shows a significant increase in a short period of time.
The median artery forms almost early in all humans and carries blood to the center of our arms to feed our growing hands. Around eight weeks, this artery usually decreases and leaves its task to two other vessels.
Anatomists have known for some time that the destruction of the middle artery is not guaranteed. in some Cases of this artery remain in the human body for a month or more. sometimes when When the baby is born, the blood flow in this artery is still pumping and only feeds the forearm or in some cases the hand.
To compare the prevalence of this stable blood channel, Lucas and colleagues examined 80 cadavers, all donated by Australians of European descent. The age of the donors at the time of death was 51 to 101 years. This means that all of them were born in the first half of the 20th century.
Noting how many times they had found a thick median artery with enough blood to carry, the researchers compared the figures with records from other studies and took into account figures that could have overrepresented the vessel’s appearance. The fact that this artery appears to be three times more common in adults today than it was more than a century ago is a surprising finding.
According to the researchers, this increase is probably due to the mutation of genes related to the development of the middle artery, or health problems of the mothers during pregnancy, or both.
One might think that having a stable median artery would provide a reliable blood supply to nimble fingers or strong forearms long after birth. However, having a middle artery puts us at risk more sick to tunnel syndrome carpal puts, an uncomfortable situation that makes us less able to use our hands.
Investigating the various factors that play a major role in the selection processes of a stable median artery requires much more research. This research shows that whatever the mentioned factors are, we will probably see more of these veins. Lucas in this load He says: If this trend continues, most people will have a middle forearm artery by the year 2100.
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