Saintis akhirnya temui sebab zakar manusia tidak mempunyai tulang

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Scientists have discovered why humans do not have a penis bone, unlike chimpanzees, bears and most other mammals.

The penis bone, or baculum, first evolved in mammals around 145 and 95 million years ago, according to new research from University College London.

The study’s lead author Matilda Brindle told The Independent one of the reasons humans had lost their penis bone was because we do not have sex for long enough to need one.


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“The common ancestors of both primates and carnivores had a baculum,” she said. “Humans are quite weird as we’re one of the few primates that doesn’t have one”

Primates who mate for three minutes or more tend to have far longer penis bones than those whose intromission, or vaginal penetration, is below three minutes, she said.

“The human intromission duration tends to be below two minutes, which most people wouldn’t expect.”

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In contrast, the aye-aye, a nocturnal lemur, copulates for around an hour at a time and has a very long baculum.

Ms Brindle said longer penis bones were also seen in species with seasonal breeding and polygamous mating systems, which humans generally do not have.

baculum.jpg
Penis bones from various mammals (Rex Features)
“Polygamous mating systems are where multiple males and multiple females all mate with each other, like in chimpanzees,” she said.


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“While polygamous mating does take place among humans, it’s not common enough to necessitate the retention of the penis bone.”

Other reasons for the lack of baculum in humans is that the human mating system takes place throughout the year and is less competitive than that of other animals.

Chimpanzees, who only have sex for around seven seconds at a time, have a very small baculum, suggesting that there might be evolutionary pressure among apes to lose the penis bone.

However, the monkeys have a polygamous mating system in which a female will mate with several males a day when she’s in heat.

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Male chimpanzees’ testicles are very large – about the same size as their brain – because they produce a lot of sperm to mate with several females.

“[Human] testicles are slightly smaller, which indicates we don’t have such a strong selection for males mating with multiple females at the same time,” said Ms Brindle.

“That’s probably the thing that finally got rid of our baculum, that we have more monogamous mating systems."

http://www.independent.co.uk/lif ... cmpid=facebook-post

Tahan dua minit jer    

hasniey

kuan 2minit

Bedah.Cun

Bila ai kepittt pishangg tue, aii rase macam kepit pepejal yangg fleksibell

Bedah.Cun

Sensasiinya, terkemutt ... kemutttt .... hhmhhvahhhvahh

insulin

Banyaknya masa dan duit kau untuk buat kajian begini.

Bedah.Cun

putehkundor

zakar tidak bertulang, ungkapan cinta menghiris kalbu....

insulin

Bedah.Cun replied at 17-1-2017 12:29 PM

Behave kak bed.

putehkundor

Male chimpanzees’ testicles are very large – about the same size as their brain

Bedah.Cun

insulin replied at 16-1-2017 04:28 PM
Banyaknya masa dan duit kau untuk buat kajian begini.

Ai rasa saintis neh cuma kena belek zakar dia snirik jer, yang

AbukRokok

2 menit je..tu yg terpaksa pakai gelang cincin tindik...ganti tulang

insulin

Bedah.Cun replied at 17-1-2017 12:31 PM
Ai rasa saintis neh cuma kena belek zakar dia snirik jer, yang

I rasa semua saintis yang mengkaji hal ni adalah perempuan, kak bed.

Bedah.Cun

insulin replied at 16-1-2017 04:33 PM
I rasa semua saintis yang mengkaji hal ni adalah perempuan, kak bed.

Woww, kalau macam tue aii pun qualify lar jadi saintiss, yangg!

Defcon2

Boleh blah la saintis-saintis mat saleh ni. Buat teori ntah hapa-hapa untuk dapat publisiti murahan.

Ini termasuk la kononnya air toilet tu lagi bersih dari ais kiub yang digunakan oleh manusia dalam minuman. Kalau dah air toilet lagi bersih, patutnya diaorang minum je air toilet tu hari-hari.

  

seri_mawr

mcm2 kajian.....

insulin

Bedah.Cun replied at 17-1-2017 12:35 PM
Woww, kalau macam tue aii pun qualify lar jadi saintiss, yangg!

Mana2 perempuan yang dah bernikah, maka bolehlah jadi "saintis".  Subjek ujikaji adalah suami sendiri.

Pajeri_Nenas

kenapa cikpit tidak berbuah? diharap unimap buat kajian pasal ni

nononcrux

kalau ade tulang asik nak naik je nanti. hahaha