 |
|
|
|
 Left: The nasal bone structure of a person of African origin. Right: Nose of a person of European origin.
March 20th, 2013
12:06 PM ET
Why our noses are different shapesThere are pouches on each side of the human nose below the eyes that are called maxillary sinuses. They're involved in sinus infections, so you may already have a bias against them. But Nathan Holton, a postdoctoral research fellow in the department of orthodontics at the University of Iowa, wanted to find out why there's such variation in these structures, and how they are affected by variation in the nasal cavity. A study on the subject is published in the journal The Anatomical Record. Holton and colleagues took computed tomography scans of 40 people. About half of them were European-Americans, and the other half were African-Americans or native South Africans. They found that the bigger the volume of the nasal cavity, the bigger the maxillary sinuses, in both populations. This is also associated with the overall face size, the researchers said, and suggests that the maxillary sinuses play a role in allowing the nose shape to vary. It appears that the sinuses make room for the nose. But when the face size is about the same, maxillary sinuses tended to be 36% larger in people of European ancestry than of African ancestry because Europeans tend to have narrower nose shapes. The various shapes of noses appear to be tied to adaptations to climate, Holton said. The nose must properly heat and humidify the air that you breathe. In a cold climate, it's advantageous to have a narrower nose. That's so that when a person inhales, more air comes into contact with the mucosal surface of nose, which provides moisture. The narrow nose maximizes the surface area. "The fact that we have sinuses seems to allow for this accommodation of variation in nasal shape, which seems to be important, in evolutionary terms, with regard to climatic adaptation," Holton said. The maxillary sinuses probably do not serve an important purpose in terms of nasal respiratory function, he said. soundoff (1,756 Responses)« Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Next »Leave a Reply to Social Media Marketing Specialist
Next entry »CDC: Higher number of children with autism
« Previous entryA health care tale of two counties
|
  About this blog
Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.
 |
|
|
|
http://martinu14z2.bloggin-ads.com/24491653/the-fact-about-van-repair-that-no-one-is-suggesting
This is a topic that's close to my heart... Cheers! Where are your contact details though?
https://www.google.gy/url?q=https://bathroomdesignrenovation.blogspot.com/2020/08/small-rv-bathroom-remodel.html/
Very good information. Lucky me I discovered your site by chance (stumbleupon). I've book-marked it for later!
http://www.bshare.cn/share?url=https://eduardoo31g0.bloguerosa.com/4126974/an-unbiased-view-of-craft-store
https://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&url=https://dallasl80p9.webdesign96.com/4727524/a-secret-weapon-for-social-media-marketing-market
Excellent site you have here but I was wondering if you knew of any user discussion forums that cover the same topics talked about in this article? I'd really like to be a part of online community where I can get opinions from other knowledgeable individuals that share the same interest. If you have any suggestions, please let me know. Thanks!
https://www.clipsit.net/www-southwestcardanniversary-com-check-your-anniversary-points/
tadalafil cvs buy cialis vidalista tadalafil reviews
Thẳng Bóng Đá Hôm Nay, Links Coi Soccer Trực Tuyến 24hlich thi dau bong da asiadTheo thể thức thi đấu, đội thắng ở cặp đấu này sẽ giành tấm vé đến Lithuania vào ngày hội bóng đá lớn nhất thế giới đến futsal. Tuyển futsal Việt Nam bước vào trận play-off lượt đi tranh vé dự play-off World Cup 2021 với sự tự tin. Tuy vậy, HLV Phạm Minh Giang bày tỏ, toàn đội không ngán Lebanon tuy vậy sẽ tìm cách để khắc chế sức mạnh của đối thủ bởi trên băng ghế huấn luyện là nhà cầm quân Ramiro Lopez, người từng dẫn dắt futsal Tây Ban Nha.|Dựa vào lịch thi đấu, bạn rất có thể sắp xếp công việc
https://rucyprus.net/detail/thedo-tv-95013.html
Way cool! Some extremely valid points! I appreciate you penning this post plus the rest of the website is really good.
http://mylesq92u1.targetblogs.com/6077245/getting-my-rv-cabinets-shop-near-me-to-work
Kênh Thẳng Soccer Thời Điểm Hôm Naybongdaso.vnTrên băng ghế huấn luyện, Lebanon đã bổ nhiệm Ramiro Lopez cơ hội đây 3 tuần. Nhà nắm quân người Tây Ban Nha nhà yếu ớt thực hiện việc trên Ý và từng có thời hạn thực hiện việc trên Kuwait.|Và NHM bóng đá Việt Nam đang hóng Minh Trí cùng đồng đội hóa giải đối thủ để tạo lợi thế mang đến trận lượt về sau đây hai ngày. Chelsea đã cần trải qua 8 phút bù giờ không thở được bảo vệ thành công.
https://murraystivoli.com/detail/xem-vtv6-online-94228.html
You made some decent points there. I checked on the web for more information about the issue and found most individuals will go along with your views on this website.
http://saveourseafarers.com/__media__/js/netsoltrademark.php?d=www.francisco3e7c6.blogscribble.com/3488918/5-tips-about-rv-repair-shop-you-can-use-today
I'm very happy to discover this great site. I want to to thank you for ones time due to this fantastic read!! I definitely liked every little bit of it and i also have you bookmarked to check out new things in your website.
https://creativecommons.org/choose/results-one?field_attribute_to_url=https://juliusg71u2.topbloghub.com/6003009/significance-of-appointed-day-successful-day-in-restructuring
When I originally commented I appear to have clicked the -Notify me when new comments are added- checkbox and from now on every time a comment is added I recieve four emails with the exact same comment. Is there an easy method you are able to remove me from that service? Kudos!
http://www.bshare.cn/share?url=https://louisq92t0.widblog.com/54644459/top-guidelines-of-local-marketing-services
An interesting discussion is worth comment. There's no doubt that that you ought to write more on this topic, it might not be a taboo subject but generally people do not speak about these topics. To the next! Cheers!!
https://www.fhwa.dot.gov/reauthorization/reauexit.cfm?link=https://sergiok70m8.blogdigy.com/local-marketing-agencies-near-me-no-further-a-mystery-14740155
Coi Thẳng Soccerbxh c1Theo thể thức thi đấu, đội thắng ở cặp đấu này sẽ giành tấm vé đến Lithuania vào ngày hội bóng đá lớn nhất thế giới đến futsal. Tuyển futsal Việt Nam bước vào trận play-off lượt đi tranh vé dự play-off World Cup 2021 với sự tự tin. Tuy vậy, HLV Phạm Minh Giang bày tỏ, toàn đội không ngán Lebanon tuy vậy sẽ tìm cách để khắc chế sức mạnh của đối thủ bởi trên băng ghế huấn luyện là nhà cầm quân Ramiro Lopez, người từng dẫn dắt futsal Tây Ban Nha.|Dựa vào lịch tranh tài, quý khách rất có thể sắp xếp làm việc
https://arubaeducation.info/detail/truc-tuyen-vtv3-94011.html
http://menedzserpraxis.hu/sharing/?menu=email&url=http://www.holden7f3w9.theisblog.com/3491145/the-greatest-guide-to-rv-repairs-near-me
This is a topic that's near to my heart... Best wishes! Exactly where are your contact details though?
https://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&url=https://stephend58h6.ttblogs.com/5456496/not-known-factual-statements-about-smoke-shop
Good info. Lucky me I discovered your blog by chance (stumbleupon). I have saved as a favorite for later!
https://tieba.baidu.com/mo/q/checkurl?url=https://finno52l2.bloginder.com/5602348/top-guidelines-of-repair-companies
Iím impressed, I must say. Rarely do I encounter a blog thatís both equally educative and entertaining, and without a doubt, you have hit the nail on the head. The problem is something not enough people are speaking intelligently about. I am very happy I stumbled across this in my hunt for something relating to this.
http://sergioq03v1.blogs-service.com/31402194/exactly-what-is-existence-coaching-and-why-daily-life-coaching-is-likely-to-be-for-you-personally
Keep this going please, great job!
https://www.federatedfinancial.com/
Kết Quả Futsal Việt Nam Vs Lebanonvietnam curacaoTheo thể thức thi đấu, đội thắng ở cặp đấu này sẽ giành tấm vé đến Lithuania trong ngày hội bóng đá lớn nhất thế giới mang đến futsal. Tuyển futsal Việt Nam bước vào trận play-off lượt đi tranh vé dự play-off World Cup 2021 với sự tự tin. Tuy vậy, HLV Phạm Minh Giang bày tỏ, toàn đội ko ngán Lebanon song sẽ tìm cách để khắc chế sức mạnh của đối thủ bởi bên trên băng ghế huấn luyện là nhà cầm quân Ramiro Lopez, người từng dẫn dắt futsal Tây Ban Nha.|Dựa vào lịch thi đấu, quý khách rất có thể chuẩn bị xếp việc làm
https://arubaeducation.info/detail/lich-phat-song-vtc-7-45325.html
A great read. I'll definitely be back.
https://dreamcares.net/taking-your-vehicle-to-an-auto-body-repair-specialist/
Nice post. I learn something new and challenging on blogs I stumbleupon everyday. It will always be interesting to read through articles from other authors and use a little something from other web sites.
http://eduardol70p9.shotblogs.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-las-vegas-jet-ski-rental-14514203
I quite like reading an article that will make people think. Also, thank you for allowing for me to comment!
https://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&url=https://jenangfoods.blogspot.com/2021/02/flooring-repair-specialist-near-me.html
Hi there! I simply would like to offer you a huge thumbs up for the excellent information you've got here on this post. I am coming back to your blog for more soon.
Can I simply say what a relief to discover a person that actually understands what they are discussing online. You actually know how to bring a problem to light and make it important. A lot more people need to look at this and understand this side of the story. I was surprised you are not more popular given that you most certainly possess the gift.
http://landenw25a3.xzblogs.com/42282357/the-2-minute-rule-for-painting-shop
A motivating discussion is definitely worth comment. There's no doubt that that you ought to publish more about this subject matter, it might not be a taboo subject but generally people do not discuss these subjects. To the next! Many thanks!!
https://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&url=https://zanders03v1.blog-gold.com/5678125/top-smoke-shop-secrets
Everyone loves it when folks come together and share views. Great blog, stick with it!
http://lukask71p9.webbuzzfeed.com/5160145/value-of-appointed-day-effective-date-in-restructuring
https://tieba.baidu.com/mo/q/checkurl?url=https://raymonde58i6.getblogs.net/31298367/not-known-details-about-craft-store
http://www.loome.net/demo.php?url=http://tubularbrass.com/with-guitars-cd-review/with-guitars
flooring
Hello there! I could have sworn Iíve been to this site before but after browsing through many of the posts I realized itís new to me. Anyhow, Iím certainly delighted I found it and Iíll be bookmarking it and checking back often!
http://sitevaluefox.com/website-value-calculator/show.php?url=https://www.ocrvmotorsports.com/
Kết Quả Futsal Việt Nam Vs Lebanontruc tiep htv 7Theo thể thức thi đấu, đội thắng ở cặp đấu này sẽ giành tấm vé đến Lithuania trong ngày hội bóng đá lớn nhất thế giới mang đến futsal. Tuyển futsal Việt Nam bước vào trận play-off lượt đi tranh vé dự play-off World Cup 2021 với sự tự tin. Tuy vậy, HLV Phạm Minh Giang bày tỏ, toàn đội ko ngán Lebanon tuy vậy sẽ tìm cách để khắc chế sức mạnh của đối thủ bởi trên băng ghế huấn luyện là nhà cầm quân Ramiro Lopez, người từng dẫn dắt futsal Tây Ban Nha.|Dựa vào lịch thi đấu, quý khách hoàn toàn có thể sắp xếp việc làm
https://arubaeducation.info/detail/u21-44851.html
nurseries
An outstanding share! I have just forwarded this onto a co-worker who had been doing a little homework on this. And he in fact bought me breakfast due to the fact that I found it for him... lol. So let me reword this.... Thanks for the meal!! But yeah, thanks for spending time to discuss this matter here on your internet site.
http://ixcharts.com/__media__/js/netsoltrademark.php?d=www.ocrvmotorcoaches.com
https://pichak.net/verification/index.php?n=39&url=www.ocrvart.com
Excellent post. I am facing some of these issues as well..
http://www.halfroundgutters.com/__media__/js/netsoltrademark.php?d=sprinterrepairnearme.com/
I blog often and I really thank you for your information. This great article has truly peaked my interest. I am going to book mark your site and keep checking for new details about once a week. I subscribed to your Feed too.
http://www.centerpointmississippi.biz/__media__/js/netsoltrademark.php?d=ocrvfleetservices.com/
Oh my goodness! Awesome article dude! Thank you, However I
am encountering problems with your RSS. I don't know the reason why I cannot subscribe to it.
Is there anybody getting the same RSS problems? Anyone who
knows the answer will you kindly respond?
Thanks!!
Hi there, just wanted to mention, I loved this article.
It was helpful. Keep on posting!
http://www.vitamed.com/__media__/js/netsoltrademark.php?d=ocrvcenter.org/
http://www.hays.info/__media__/js/netsoltrademark.php?d=sprintervanrepair.com/
http://emktg.cihi.ca/UrlTracking.aspx?em_key=08jafBPP2lWZoOqmzY/BzF3hFU9jQvN9pRYQwdGchCoOfLXGIWW6Y6UWEMHRnIQqHYmVVeX23ik5bqfdhCmHXL3vARe3YTEE&em_url=https://ocrv.us/
This website truly has all of the info I wanted concerning this subject and didnít know who to ask.
http://ea.delawarecpf.com/__media__/js/netsoltrademark.php?d=fleettruckrepairshop.com
http://www.2-rabbits.com/__media__/js/netsoltrademark.php?d=campervanrepairshop.com
May I simply just say what a comfort to find someone that really understands what they're discussing on the internet. You actually know how to bring an issue to light and make it important. More people ought to read this and understand this side of your story. It's surprising you are not more popular since you certainly possess the gift.
http://www.downeastlobsterbakes.com/__media__/js/netsoltrademark.php?d=ocrvparts.com/
Usually I never comment on blogs but your article is so convincing that I never stop myself to say something about it. You're doing a great job Man,Keep it up.
https://www.phono-mundial.com/auto-body-repairs-solutions-to-make-sure-speed-and-functionality-of-your-automobile/
Tỷ Số đá Bóng Trực Tuyến Thời Điểm Hôm Naythvl truc tuyenTheo thể thức thi đấu, đội thắng ở cặp đấu này sẽ giành tấm vé đến Lithuania vào ngày hội bóng đá lớn nhất thế giới mang đến futsal. Tuyển futsal Việt Nam bước vào trận play-off lượt đi tranh vé dự play-off World Cup 2021 với sự tự tin. Tuy vậy, HLV Phạm Minh Giang bày tỏ, toàn đội ko ngán Lebanon tuy nhiên sẽ tìm cách để khắc chế sức mạnh của đối thủ bởi bên trên băng ghế huấn luyện là nhà cầm quân Ramiro Lopez, người từng dẫn dắt futsal Tây Ban Nha.|Dựa vào lịch tranh tài, bạn hoàn toàn có thể chuẩn bị xếp công việc
https://questiontime.info/detail/bong-da-lu-tivi-truc-tiep-130021.html
Usually I never comment on blogs but your article is so convincing that I never stop myself to say something about it. You're doing a great job Man,Keep it up.
https://www.google.com/maps/place/Relentless+Collision/@35.8167572,-78.597496,15z/data=!4m5!3m4!1s0x0:0xecfa0d223ab3249d!8m2!3d35.8167572!4d-78.597496