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Tag: "beating" at biology news

Slowing the racing heart

...me acts on the heart's pacemaker to slow the rapid beating of the heart's "fight-or-flight" reaction to adren...chamber is responsible for setting the pace of the beating heart, triggering its neighbor cells to beat. In the human heart, one cell -- the pacemaker cell -- ...

Why is the heart heart-shaped?

...be and eventually the chambers. Since the heart is beating as it develops, they asked whether cardiac function influences cell shape. Using zebrafish mutants with functional defects, they found that both blood flow and cardiac contractility influence cardiac cell shape. The researchers propose that a balance...

Engineering the heart piece by piece

...s generated when the tissue begins contracting and beating on its own. In the new paper, the team reports that it has achieved a doubling of the contracting force in just seven days, by stretching the BEHM at 1 Hertz. The growing of heart muscle, heart valve and blood vessel tissue in the lab also requir...

Fish can determine their social rank by observation alone, study finds

...chlids are constantly trying to ascend socially by beating each other up," said study co-author Russell D. Fernald, professor of biological sciences at Stanford. "It would be really valuable for them to know in advance who to pick a fight with." The Nature experiment was designed by lead author Logan Gros...

Performing surgery on a beating heart may be safer

...als, coronary artery bypass surgery performed on a beating heart, without the aid of a heart-lung machine, is....?According to Raja, performing the surgery on the beating heart, while more technically challenging for the surgeon, keeps these side effects low and allows f...

Researchers show that veins stiffen as we age

...our circulatory system. Every minute, the steady beating of that amazing living pump--your heart--sends about five quarts of blood through the 60,000-mile network of arteries, capillaries and veins in your body. The muscular arteries carry blood away from the heart and out to your organs and limbs. Microsc...

A new approach to growing heart muscle

...the force generated within the tissue of an actual beating heart, but it's much higher than the forces created by engineered heart tissue samples grown and reported by other researchers. Birla says the team expects to see greater forces created by BEHM in future experiments that will bathe the cells in an en...

Getting to the heart of the heart

...ives rise to both myocardial cells, which form the beating muscle and electrically conductive tissue of the heart, and to the vascular smooth muscle cells that line the heart's blood vessels. This cell is responsible for the formation of the left-sided chambers of the heart, the first chambers to form in the...

3-D ultrasound scanner could guide robotic surgeries

...at the device can produce actual 3-D images of the beating hearts in animals. The team has since demonstrated that the scanner also can be used to laparoscopically image other organs, including the spleen, liver and gall bladder. In the current study, the researchers used the scanner to identify coordina...

Clot-busting drug helps revive cardiac arrest patients

...lot in the lungs, or other causes. The heart stops beating and the brain starts to suffer permanent damage within four to six minutes. Death quickly follows. The standard treatment for cardiac arrest is Advanced Cardiac Life Support (ACLS) measures, which include cardiopulmonary resuscitation (CPR), drugs ...

Beekeepers work hard for the honey, despite changing tupelo forest

...es. One reason is because the forest has taken a beating from more than 45 years of dredging of the Apalachicola for a river navigation project. The dumping of the dredged material has cut off many tupelo trees from their source of fresh water. Upstream water diversion also has lessened the flooding needed...

Engineered heart tissue offers insights into irregular heartbeats, defibrillator failure

...ia -- a condition characterized by abnormally fast beating of the heart's pumping chambers. In particular, they sought to understand how such arrhythmia may lead to ventricular fibrillation, in which the heart's electrical activity becomes disordered, causing the ventricles to flutter rather than synchronous...

Mice with glowing hearts shed light on how hearts develop

...he heart is the first organ to function and starts beating prior to its full development. "We knew that the...he surface of the developing heart that delays the beating between the upper to lower parts of the heart. After 13.5 days of development, the two portions of t...

Protein 'nanosprings' most resilient found in nature

...the ion channels and transporters that control the beating of the heart. In 2004, Bennett's team linked mutations in the gene ankyrin-B to an inherited cardiac arrhythmia syndrome that can lead to sudden death ( http://www.dukemednews.org/news/article.php?id=9389 ). Earlier study of the atomic structure of ...

For one Stanford doctor, the beat goes on during open-heart surgery

...eon Kai Ihnken demonstrated how he repositions the beating heart while it's still inside the chest of a 78-ye...ry. The surgeon reached into the chest, lifted the beating heart out, then craned his neck to the side, just so, searching for the right spot on the back of th...

Fruit fly's beating heart helps identify human heart disease genes

...logy to visualize in detail for the first time the beating of the heart of a fruit fly, an insect the size of...etina in the eye, to obtain detailed images of the beating heart of an adult, unanesthetized fly. "After inserting into the fly the gene that we know is impli...

Rare Tibetan antelope listed as endangered

...Duke's Pratt School of Engineering have imaged the beating hearts of dogs. The engineers said their demonstration showed that the probes could give surgeons a better view during human endoscopic surgeries in which operations are performed through tiny "keyhole" incisions. If the probes prove beneficial in h...

3D ultrasound device poised to advance minimally invasive surgery

...Duke's Pratt School of Engineering have imaged the beating hearts of dogs. The engineers said their demonstration showed that the probes could give surgeons a better view during human endoscopic surgeries in which operations are performed through tiny "keyhole" incisions. If the probes prove beneficial in h...

Researchers learn how blood vessel cells cope with their pressure-packed job

...o the direction of rhythmic stretching caused by a beating heart. Such an orientation of stress fibers is a h...he rising-and-falling blood pressure produced by a beating heart. The researchers also demonstrated that inhibition of either Rho or a related protein called...

Women feel more pain than men, research shows

...arful of anxiety-related sensations (e.g., rapidly beating heat), and seems to be important in the experience of pain sensations. In a study of 150 patients referred to a hospital clinic with chest pain, researchers discovered that the factors that predicted pain in men and women were different. Researchers...

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