Featured Research

from universities, journals, and other organizations

Experts discover why Rudolph's nose is red

Date:
December 17, 2012
Source:
BMJ-British Medical Journal
Summary:
Rudolph's nose is red because it is richly supplied with red blood cells which help to protect it from freezing and to regulate brain temperature.

Researchers analyzed a reindeer's temperature while on a treadmill. In the arctic, reindeer have evolved to keep warm - but like all animals, sometimes they need to cool down. Unlike humans, they cannot sweat, so have to use their nose as a heat exchanger.
Credit: Image courtesy of BMJ-British Medical Journal

Rudolph's nose is red because it is richly supplied with red blood cells which help to protect it from freezing and to regulate brain temperature.

This superior "nasal microcirculation" is essential for pulling Santa Claus's sleigh under extreme temperatures, reveals a study in the Christmas issue published on the British Medical Journal website.

Tiny blood cells (known as micro-vessels) in the nose are vital for delivering oxygen, controlling inflammation, and regulating temperature, but few studies have assessed their function in detail.

Knowing how important this regulation is for flying reindeer, who have to deal with extremes of temperature while pulling a sleigh, researchers in the Netherlands and Norway set out to test whether Rudolph's infamous red nose was due to "a highly dense and rich nasal microcirculation" compared with human noses.

Using a hand-held video microscope, they first assessed the noses of five healthy human volunteers and found a circulating blood vessel density of 15 mm/mm2.

When the technique was applied to two reindeer noses, the researchers found a 25% higher density of blood vessels, carrying a super-rich concentration of red blood cells.

They also found a high density of mucous glands scattered throughout the reindeer noses, which they say helps "maintain an optimal nasal climate during changing weather conditions and extremes of temperature as well as being responsible for fluid transport and acting as a barrier."

Infrared thermal images showed that reindeer do indeed have red noses.

"The microcirculation of the nasal mucosa in reindeer is richly vascularised and 25% denser than that in humans," say the authors. "These factors explain why the nose of Rudolph, the lead flying reindeer employed by Santa Claus to pull his sleigh, is red and well adapted to carrying out his duties in extreme temperatures."

Video: http://www.youtube.com/watch?v=sbnvBm4u5VQ


Story Source:

The above story is based on materials provided by BMJ-British Medical Journal. Note: Materials may be edited for content and length.


Journal Reference:

  1. C. Ince, A.-M. van Kuijen, D. M. J. Milstein, K. Yuruk, L. P. Folkow, W. J. Fokkens, A. S. Blix. Why Rudolph's nose is red: observational study. BMJ, 2012; 345 (dec14 14): e8311 DOI: 10.1136/bmj.e8311

Cite This Page:

BMJ-British Medical Journal. "Experts discover why Rudolph's nose is red." ScienceDaily. ScienceDaily, 17 December 2012. <www.sciencedaily.com/releases/2012/12/121217190634.htm>.
BMJ-British Medical Journal. (2012, December 17). Experts discover why Rudolph's nose is red. ScienceDaily. Retrieved April 24, 2014 from www.sciencedaily.com/releases/2012/12/121217190634.htm
BMJ-British Medical Journal. "Experts discover why Rudolph's nose is red." ScienceDaily. www.sciencedaily.com/releases/2012/12/121217190634.htm (accessed April 24, 2014).

Share This



More Plants & Animals News

Thursday, April 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Fungus Killing Bats, Spreading in US

Deadly Fungus Killing Bats, Spreading in US

AP (Apr. 24, 2014) A disease that has killed more than six million cave-dwelling bats in the United States is on the move and wildlife biologists are worried. White Nose Syndrome, discovered in New York in 2006, has now spread to 25 states. (April 24) Video provided by AP
Powered by NewsLook.com
Blood From World's Oldest Woman Suggests Life Limit

Blood From World's Oldest Woman Suggests Life Limit

Newsy (Apr. 24, 2014) Scientists say for the extremely elderly, their stem cells might reach a state of exhaustion. This could limit one's life span. Video provided by Newsy
Powered by NewsLook.com
Raw: Kangaroo Rescued from Swimming Pool

Raw: Kangaroo Rescued from Swimming Pool

AP (Apr. 24, 2014) A kangaroo was saved from drowning in a backyard suburban swimming pool in Australia's Victoria state on Thursday. Australian broadcaster Channel 7 showed footage of the kangaroo struggling to get out of the pool. (April 24) Video provided by AP
Powered by NewsLook.com
Monkeys Are Better At Math Than We Thought, Study Shows

Monkeys Are Better At Math Than We Thought, Study Shows

Newsy (Apr. 23, 2014) A Harvard University study suggests monkeys can use symbols to perform basic math calculations. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins