why do only humans have periods ?

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why do only humans have periods ?

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https://eusci.org.uk/2020/04/09/why-do-humans-and-so-few-other-animals-have-periods

https://eusci.org.uk/2020/04/09/why-do-humans-and-so-few-other-animals-have-periods
Why do humans – and so few other animals – have periods?
Every cycle, before an egg is released from the ovaries, reproductive hormones like progesterone cause the lining of the uterus – the endometrium – to thicken and fill with blood vessels. If the egg is fertilised, the uterus is ready to receive it so that it can implant and start growing.
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https://www.healthline.com/health/why-do-women-have-periods

https://www.healthline.com/health/why-do-women-have-periods
Why Do Women Have Periods? – Healthline
A period (menstruation) is normal vaginal bleeding that is a natural part of a healthy monthly cycle for a person with a uterus and ovaries. Every month, in the years between puberty (typically…

https://www.forbes.com / sites / quora / 2016 / 05 / 06 / how-and-why-did-women-evolve-periods

https://www.forbes.com / sites / quora / 2016 / 05 / 06 / how-and-why-did-women-evolve-periods
How And Why Did Women Evolve Periods? – Forbes
6 mai 2016Those moments of sheer unadulterated altruism exist, but they’re interspersed with weeks or months of overwhelming nausea, exhaustion, crippling backache, incontinence, blood pressure issues, and…

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3528014

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3528014
The evolution of menstruation: A new model for genetic assimilation
Here, we present our answer to this long-debated question, arguing that (i) menstruation occurs as a mechanistic consequence of hormone-induced differentiation of the endometrium (referred to as spontaneous decidualization, or SD); (ii) SD evolved because of maternal-fetal conflict; and (iii) SD evolved by genetic assimilation of the decidualiza…

https://www.youtube.com/watch?v=cjbgZwgdY7Q

https://www.youtube.com/watch?v=cjbgZwgdY7Q
Why do women have periods? – YouTube
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periodsA handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’…

https://www.unicef.org/press-releases/fast-facts-nine-things-you-didnt-know-about-menstruation

https://www.unicef.org/press-releases/fast-facts-nine-things-you-didnt-know-about-menstruation
FAST FACTS: Nine things you didn’t know about menstruation – UNICEF
Menstruation is stigmatized all over the world. Menstruation is a normal and healthy part of life for most women. Roughly half of the female population — around 26 per cent of the global population [i] — are of reproductive age. Most women menstruate each month for about two to seven days.

https://theconversation.com/explainer-why-do-women-menstruate-13744

https://theconversation.com/explainer-why-do-women-menstruate-13744
Explainer: why do women menstruate? – The Conversation
Invasive embryos A more plausible explanation for menstruation is that it evolved to accommodate the peculiar way in which human embryos embed into the lining of the uterus – the endometrium -…

https://askabiologist.asu.edu/period-cycle

https://askabiologist.asu.edu/period-cycle
What Is The Period Cycle? | Ask A Biologist
During the menstrual cycle, different hormones tell the female body to prepare for pregnancy. But if a woman does not become pregnant, she experiences menstruation. Menstruation, or a period, is when blood and tissue are released from the vagina. Periods last for three to seven days, and they happen about every 28 days.

https://www.scientificamerican.com/article/what-is-the-point-of-a-period

https://www.scientificamerican.com/article/what-is-the-point-of-a-period
What Is the Point of a Period? | Scientific American
Menstruation, of course, is essential to human reproduction and therefore survival. It is also one of the biological processes that makes us special because humans, chimpanzees, bats and…

https://www.thewomens.org.au/health-information/periods/periods-overview/about-periods

https://www.thewomens.org.au/health-information/periods/periods-overview/about-periods
About periods | The Royal Women’s Hospital
The average cycle is 28 days but, for some women, it is as short as 21 days, for others it is as long as 35 days. When you first start having periods, it can also take a while before your periods develop a regular pattern. Your cycle also changes as you get older. Your menstruation cycle (and period) stops temporarily when you are pregnant.
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