Strange Tale of Lizard Breathing

Lizard lungs have air flow only in one direction, unlike humans and most other animal.

Air through the lungs in one direction, some species of lizards world 's largest mass extinction may want to rethink about how it evolved following a finding mites , a study said Wednesday.

Accordingly, humans and many other animal system , breathing a so-called " tidal ", or there are two ways .

Bundles of cells called alveoli - havaakciğer until it is drawn to a dead end . Here is oxygen and then drawn into the breathing air for carbon dioxide used is changed.

Birds, though, this is a notable exception .

These are mainly the respiratory , lungs , a one-way flow - air , enters the trachea, or windpipe, is a yöndeakcig flows out and then came the

This unusual pattern of breath has raised much debate among biologists .

One theory , which provides a one-way flow of oxygen for strenuous activity is a highly efficient way : that flying birds and fine concentration of oxygen at altitude with the help cope with ilgilief .

But, surprisingly, the lizard - an animal sleepy land-loving group - Ayrıcay new probe , according counted as members of the club .

Utah biologist C. G. University Çiftçihav içinhayv see how the movement of those five African monitor lizard ( Varanus Exanthematicus ) Pulmonology 3 - D scans and then led a team that conducted implanted flow meters .

In addition, 10 dead lizard air is pumped into the lungs and then water , as an audience loaded with sunflower pollen . They showed a very one-sided flow .

Researchers havakertenkele for each lung - enters the trachea and then were separated into two airways .

Before then doubled again , perforated walls , passing each lung winds its way through a series of rooms . Dışarıkullanıl gas heads through the trachea . Such as birds , some of the " tidal " flow , but there is not much .

A similar one-way flow is under water , whether or not at the same time , help them with their literally hold your breath , there appears among American alligators , Farmer said in a telephone interview .

If so , one way to breathe some hakkındadüşün - helps to maintain a high metabolism - you need to scrap .

" I probably think it's not an adaptation that allows an animal to be active ," said the farmer .

"In fact, their breath, sit quietly for a long time without moving an adaptation to allow ( is likely to be ) , " he said.

How others unidirectional flow of a few species become established , but it is not it?

There is a clear answer , but the Permian and Triassic geological period a hint at the border between , a large extinction occurred 251 million years ago may lie .

Almost all sea creatures and land vertebrate species two-thirds of atmospheric oxygen associated with serious and long- term decline wiped out by some catastrophic event .

One-way air flow, or it had içinöncü animals, the early Triyasoksij - may have been an advantage in poor environments , Farmer suggested.

Ancestors to birds and crocodilians "I already had a one-way flow may have entered a period of one lung iletrias " he said.

" This stream once established , these animals when there is no oxygen in the air compared to the amount of oxygen in the blood vessels become more efficient to organize such a way that a pre - can adapt . "

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