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Ngày đăng: 05/08/2016

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Periods are a necessary part of human reproduction, but most other
animals don’t have them. If they don’t need them, why do we? Can Girls
Really Synchronize Their Periods? ►►►►http://bit.ly/1qyljKH Follow Sapna
on Twitter! ►►►►https://twitter.com/sapna_parikh Sign Up For The
TestTube Newsletter Here ►►►► http://bit.ly/1myXbFG Read More: Why Do
Women Have Periods When Most Animals Don’t?
http://www.bbc.com/earth/story/20150420-why-do-women-have-periods “Most
women menstruate. But most other female animals don't bleed outwardly
like us. Even among those that give birth to live young as we do, only a
handful of species menstruate. So menstruation isn't just inconvenient
and unpleasant: it's also a mystery. Why do we menstruate at all? And if
it's such a good idea, why don't other animals do it?” The Evolution of
Human Reproduction: A Primatological Perspective
http://onlinelibrary.wiley.com/doi/10.1002/ajpa.20734/abstract;jsessionid=B701FACB5CB55247F550981CD68CF30E.f01t01
“Successful reconstruction of any aspect of human evolution ideally
requires broad-based comparisons with other primates, as recognition of
general principles provides a more reliable foundation for inference.
Indeed, in many cases it is necessary to conduct comparisons with other
placental mammals to test interpretations.” The Evolution of
Endometrial Cycles and Menstruation
http://www.journals.uchicago.edu/doi/10.1086/419369 “According to a
recent hypothesis, menstruation evolved to protect the uterus oviducts
from sperm-borne pathogens by dislodging infected endometrial tissue and
delivering immune cells to the uterine cavity...I propose the
alternative hypothesis that the uterine endometrium is shed/resorbed
whenever implantation fails because cyclical regression and renewal is
energetically less costly than maintaining the endometrium in the
metabolically active state required for implantation.”
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