but they all have a few things in common. These include something to carry oxygen around their bodies, a fluid of some sort, and some "plumbing" – in humans (and a number of other species) the fluid is calledbloodand the plumbing is our ...
is not blue. In fact, no kind of human blood is blue. If anything, deoxygenated blood is even redder than regular, oxygenated blood. If you have ever had your blood drawn and noticed its color, you would clearly know that deoxygenated blood is a dark red. ...
Scientists are still trying to figure out why there are so many different blood types and where they came from. We know that blood types are not unique to humans. Dogs, cats, horses and monkeys, to name a few, also have them – but ...
Why Do Humans Have Fingernails And Toenails? The Evolutionary Origins Of Nails Humans are distinct from other animals in many ways—cognitive capacity, hairlessness, and our opposable thumb—but having nails isn’t one of them. Our ancestors, primates, also have finger and toenails that look lik...
Why we have different blood types and why they matterKeegan LarwinJessica Orwig
A fetus with such unrestricted access can manufacture hormones to increase the mother's blood sugar, dilate her arteries, and inflate her blood pressure. Most mammal mothers can expel or reabsorb embryos if required, but in humans, once the fetus is connected to the blood supply, severing ...
Since HEV-3 has been transmitted by blood transfusion to other humans, testing of blood donors has been introduced or introduction is being discussed in some industrialised countries. In this article we summarise the arguments in favour of testing all blood donations for HEV-3. Conclusion: The ...
yawning increases cerebral blood flow so can improve alertness." what about our friends' contagious yawning? some think it comes down to empathy . while all vertebrate mammals yawn, only humans and chimpanzees 'catch' yawns from others. studies ...
Why do some people hate redheads? If you have ever experienced inexplicable ginger hate, this page may be just for you! If you can relate, leave your comments so others don't feel alone.
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