Navigation Links
How alligators rock and roll
Date:3/13/2008

gmatic muscle, to shift the position of their lungs. The gases in the lungs buoy up the animal, but if shifted forward and backward cause the animal to pivot in a seesaw motion. When the animals displace gases to the right or left side of the body, they roll.

Uriona says that during the Triassic Period, which began 250 million years ago, the crocodilian ancestors of alligators were cat-sized animals that lived only on land.

Until now, it was believed the diaphragmatic muscle evolved to help them breathe and run at the same time, he says. Showing they are actually using it to move around in water gives an alternative explanation for why the muscle evolved.

It also suggests the muscle didnt evolve until after crocodilians took to the water during the Cretaceous Period, which began 145 million years ago. During that time alligators ancestors also evolved a flattened skull, shorter limbs and a big tail.

Studying the Crocodile Rock

The study involved five, 2-year-old American alligators (Alligator mississippiensis) from Louisianas Rockefeller Wildlife Refuge near Grand Chenier. The gators were only 15 inches to 20 inches long, compared with adults that can reach 15 feet.

Electrodes were implanted on five sets of muscles so their activity could be monitored while the alligators maneuvered in 100-gallon fish tanks. One set of muscles played no role in moving the lungs to help the gators dive and maneuver, but four did:

  • The diaphragmaticus, which plays a role in breathing like the diaphragm that separates the chest cavity from the abdominal cavity in humans and other mammals. But in gators, it runs parallel to the belly and encases the stomach and intestines. When an alligator inhales, the diaphragmaticus pulls the liver back toward the pelvis and tail. The liver is attached to the lungs, so when the liver is pulled back, it expands the lungs.

  • The ischiopubis muscl
    '/>"/>

Contact: Lee Siegel
leesiegel@ucomm.utah.edu
801-581-8993
University of Utah
Source:Eurekalert  

Page: 1 2 3 4 5

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
How alligators rock and roll
(Date:7/25/2014)... engineering at the University of Houston, has written ... organ development., "Introduction to Tissue Engineering: Applications and ... the field of artificial organ development. Metin Akay, ... UH, served as a series editor on the ... published books on the subject of growing artificial ...
(Date:7/25/2014)... (NRG1) is a pleiotropic factor characterized by the ... of exons that confer to the protein deeply ... both the myelination occurring during development and the ... nerve: axon degeneration, axon regrowth, remyelination and target ... have discovered that the soluble NRG1 upregulation observed ...
(Date:7/25/2014)... that the age girls reach puberty is influenced by ,imprinted ... parent contributes the gene. This is the first evidence ... birth and details of this study were published today in ... period, known as menarche, is a marker for the timing ... onset of menses varies between girls, is an inherited trait, ...
Breaking Biology News(10 mins):University of Houston researcher publishes textbook on tissue engineering 2Could age of first period influence development of diseases in older women? 2
... Oct. 16, 2012  Today 23andMe, the leading personal ... as Vice President Communications, Neil Rothstein as Vice ... Strategic Alliances joining the company,s executive leadership team. ... Castro is responsible for the company,s corporate communications, ...
... MedNet Solutions, a global life sciences technology solutions ... & Data Corporation (SDC), a specialized Contract Research Organization ... services to the life sciences industry, are pleased to ... ™ EDC platform as their eClinical ...
... MOUNTAIN VIEW, Calif. and RAANANA, Israel, Oct. 23, ... ), the leading licensor of silicon intellectual property ... Ltd, a global supplier of embedded speech processing ... deliver enhanced speech processing solutions for smart devices, ...
Cached Biology News:23andMe Names Christine Castro, Neil Rothstein and Jonathan Ward to Leadership Positions 2Statistics & Data Corporation Selects MedNet Solutions As Strategic Technology Partner 2Statistics & Data Corporation Selects MedNet Solutions As Strategic Technology Partner 3CEVA, Rubidium Partner to Deliver Speech Processing Solutions based on the CEVA-TeakLite Family of DSPs 2CEVA, Rubidium Partner to Deliver Speech Processing Solutions based on the CEVA-TeakLite Family of DSPs 3
(Date:7/24/2014)... MESA, Calif. , July 24, 2014  Now ... close to home. Rehealth Regenerative Therapies , located ... athletes and other physically active people a new health ... Regardless of age, countless patients suffer from ... sport activities, such as muscle tears, torn rotator cuff, ...
(Date:7/24/2014)... Security forces worldwide rely on sophisticated equipment, trained ... other public areas against terrorist attacks. A revolutionary ... about to make their job much easier. , ... Patolsky of Tel Aviv University ,s School of ... developed by the Herzliya company Tracense, picks up ...
(Date:7/24/2014)... Distinguished Professor of Engineering at the University of ... solve problems in energy engineering, environmental sustainability and ... zeolites, porous rock with a well-defined, crystalline structure. ... so precisely decided that zeolites can separate molecules ... an angstrom (one-tenth of a nanometer), making them ...
(Date:7/24/2014)... -- Research and Markets has announced the ... Instruments Market 2014-2018" report to their offering. ... is the study of the gene and its functions ... functions of proteomes or sets of proteins by using ... the mapping of genes and DNA sequencing to understand ...
Breaking Biology Technology:Stem Cells In Sports Injuries, Joints And Muscular Pain 2Stem Cells In Sports Injuries, Joints And Muscular Pain 3Nano-sized chip 'sniffs out' explosives far better than trained dogs 2University of Delaware researcher describes new approach for creating organic zeolites 2Global Genomics and Proteomics Analytical Instruments Market 2014-2018: Key Vendors are Agilent, Bio-Rad , F. Hoffmann, La Roche, Illumina, PerkinElmer and Thermo Fisher Scientific 2
... 15 The Vical Incorporated,(Nasdaq: VICL ) ... on,Monday, September 22, at 1 p.m. Eastern Daylight ... through the Events page at http://www.vical.com ., ... biopharmaceutical products based on its,patented DNA delivery technologies ...
... BioMed Realty Trust, Inc.,(NYSE: BMR ) today announced ... dividend of $0.335 per share of common stock. The,dividend is ... BioMed also announced that its board of directors has ... Series A Cumulative,Redeemable Preferred Stock for the period from July ...
... of Institutional Investors to Attend Conference, MONTREAL, ... ("ProMetic"), today announced that Mr. Pierre Laurin, President,and ... Ford,s 5th,annual Investor Summit on September 16, 2008 ... the Mark Hopkins InterContinental Hotel in San Francisco., ...
Cached Biology Technology:Vical to Present at UBS Global Life Sciences Conference 2BioMed Realty Trust Declares Third Quarter 2008 Common Stock and Preferred Stock Dividends 2ProMetic to present at Merriman Curhan Ford's Investor Summit 2008 on September 16th 2
... Proteolytic degradation is critical to the ... and regulatory proteins as important and ... metabolism, heat shock and stress response, ... receptors and ion channels, cell cycle ...
... scanner serves as the spot-picking platform. This ... rack positions on the tray, leaving space ... on the remaining two racks.,The software allows ... mouse-click on the scanned gel image. The ...
...
... configured specifically for pharmaceutical powder packaging, ... are precision-joined to create ultra-smooth surfaces ... and disinfect. One-inch radius corners simplify ... strong, rigid surface without external bracing. ...
Biology Products: