Tag Archives: second

Heart valve surgery – operation for replacement heart valves

September 26, 2013Surgeryand, arteries, beating, blister, blood, calories, diet, Drug, eating, Exercise, Flu, for, gallery, Gym, Health Health, health video, heart, Heart valve, Heart valve Asia, Heart valve for Weight gallery, Heart valve for Weight Health photo, Heart valve Gallery, Heart valve Health, Heart valve Health History, Heart valve Health Information, Heart valve Health Latest, Heart valve Health Photo, Heart valve over Picture, Heart valve Photo Gallery, Heart valve Picture, Heart valve Video, Heart valve Web, history, in, is, Lap picture, laparoscopy, Malaysia Health, medical, muscles, Nutrition, of, on, operation, organic, photo, physical, picture, prevent, second, skin, spiritual, Surgery, symptoms, The, tips, to, training, video, video photo, video surgery, virus, web, web Health, web Health picture, weightlossazuan

Heart valve surgery – operation for replacement heart valves

[media id=83 width=500 height=400]

heart valves maintain the unidirectional flow of blood in the heart by opening and closing depending on the difference in pressure on each side. They are mechanically similar to reed valves.

Atrioventricular valves

These are small valves that prevent backflow from the ventricles into the atria during systole. They are anchored to the wall of the ventricle by chordae tendineae, which prevent the valve from inverting.

The chordae tendineae are attached to papillary muscles that cause tension to better hold the valve. Together, the papillary muscles and the chordae tendineae are known as the subvalvular apparatus. The function of the subvalvular apparatus is to keep the valves from prolapsing into the atria when they close. The subvalvular apparatus have no effect on the opening and closure of the valves, however. This is caused entirely by the pressure gradient across the valve.

The closure of the AV valves is heard as the first heart sound

Echocardiography — The echocardiogram is an ultrasound of the heart. Using standard ultrasound techniques, two-dimensional slices of the heart can be imaged.

Heart — The heart is a hollow, muscular organ in vertebrates that pumps blood through the blood vessels by repeated, rhythmic contractions, or a similareart. Veins form part of the circulatory system. The vessels that carry blood …

Vein — In biology, a vein is a blood vessel which carries blood toward the heart. Veins form part of the circulatory system

The tricuspid valve is the three flapped valve on the right side of the heart, between the right atrium and the right ventricle which stops the backflow of blood between the two. It has three cusps.

Semilunar valves

These are located at the base of both the pulmonary trunk (pulmonary artery) and the aorta, the two arteries taking blood out of the ventricles. These valves permit blood to be forced into the arteries, but prevent backflow of blood from the arteries into the ventricles. ^[1] These valves do not have chordae tendineae, and are more similar to valves in veins than atrioventricular valves.

Aortic valve

Main article: aortic valve

The aortic valve lies between the left ventricle and the aorta. The aortic valve has three cusps. During ventricular systole, pressure rises in the left ventricle. When the pressure in the left ventricle rises above the pressure in the aorta, the aortic valve opens, allowing blood to exit the left ventricle into the aorta. When ventricular systole ends, pressure in the left ventricle rapidly drops. When the pressure in the left ventricle decreases, the aortic pressure forces the aortic valve to close. The closure of the aortic valve contributes the A2 component of the second heart sound (S2).

The most common congenital abnormality of the heart is the bicuspid aortic valve. In this condition, instead of three cusps, the aortic valve has two cusps. This condition is often undiagnosed until the person develops calcific aortic stenosis. Aortic stenosis occurs in this condition usually in patients in their 40s or 50s, an average of over 10 years earlier than in people with normal aortic valves.

Pulmonary valve

Main article: pulmonary valve

The pulmonary valve (sometimes referred to as the pulmonic valve) is the semilunar valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps. Similar to the aortic valve, the pulmonary valve opens in ventricular systole, when the pressure in the right ventricle rises above the pressure in the pulmonary artery. At the end of ventricular systole, when the pressure in the right ventricle falls rapidly, the pressure in the pulmonary artery will close the pulmonary valve.

The closure of the pulmonary valve contributes the P2 component of the second heart sound (S2). The right heart is a low-pressure system, so the P2 component of the second heart sound is usually softer than the A2 component of the second heart sound. However, it is physiologically normal in some young people to hear both components separated during inhalation.

Heart valve,Heart valve Health, Heart valve Health Latest,Heart valve Health Information,Heart valve Health information, Heart valve Health Photo,Heart valve for Weight Health photo, Heart valve Health Latest, Heart valve Health latest, Heart valve Video, Heart valve video, Heart valve Health History,Heart valve Health history, Heart valve over Picture, history, Heart valve Asia, Heart valve asia, Heart valve Gallery, Heart valve for Weight gallery, Heart valve Photo Gallery, Heart valve Picture, Lap picture, Heart valve Web, Malaysia Health, web Health, web Health picture, video photo, video surgery, gallery, laparoscopy, virus, flu, drug, video, Health Health, calories, photo, nutrition, health video, symptoms, Heart valve, medical, beating, diet, physical, Training, organic, gym, blister, exercise, weightloss, surgery, spiritual, eating, tips, skin, operation,

A new generation

July 21, 2012Uncategorizeda new generation, a new generation draws the line, a new generation in international strategic management, a new generation of, amityville a new generation, and, children, conservation for a new generation, first, home, how, in, it's a new generation, john f kennedy and a new generation, lives, million, new generation, newgeneration org, next generation, not, Not Generation, of, or, partnership for a new generation of vehicles, Pew Hispanic Center, ricky dillard new generation, Ruben Rumbaut, Ruben Rumbaut University California Irvine, second, star treck new generation, startrek new generation, the taste of a new generation, there's a new generation, to, US, we are a new generation, we are we are a new generation, workVincent Yong

Campaigners want the legal limbo of young immigrants resolved 

They were brought to the US at a young age by the parents, first generation immigrants who often still have close ties to their home countries.

Younger brothers and sisters were born in America, second generation immigrants who enjoy the status of US citizens.

Not Generation 1.5. Despite having lived most of their lives in the US and speaking fluent English, many cannot legally work, vote or drive in most US states.

They are subject to arrest and deportation just like any other undocumented migrant.

“They fear being deported but many of them don’t know (anything) other than English, so they have no idea what awaits (them) in their countries of origin, said Ruben Rumbaut of the University of California in Irvine, who coined the Generation 1.5 term.

There are no official figures of how many undocumented children live in the US, but the Pew Hispanic Center estimates that 7% of all Hispanic children are unauthorised immigrants.

This suggest there are 1.1 million Latino children who are not US citizens.

Living robots powered by muscle

July 20, 2012Uncategorizedand, back exercise, back pain exercise, back stretching, BBC, become more flexable, belly fat loss, benefits of stretching, best diet to lose weight, best diets, best fat loss, best way to lose weight, best ways to lose weight, best weight loss, body fat, body fat loss, bodybuilding fat loss, build your own robots, burn fat, burn fat fast, butterfly stretch, buy robots, calories fat loss, can, cardio fat loss, Carlo Montemagno, chest stretches, conditioning, define flexability, definition of flexability, definition of flexibility, diet lose weight fast, diet loss, diet tips, diet to lose weight, diet weight, dieting, dieting tips, diets, diets online, diets to lose weight, easy fat loss, easy way to lose weight, easy ways to lose weight, easy weight loss, eat healthy, eat to lose weight, educational robots, effective weight loss, endurance, exercise and fat loss, exercise fat, exercise for lower back pain, exercise lose weight, exercise loss, exercise to lose weight, exercises fat, exercises for back pain, exercises for flexability, exercises for low back pain, exercises for lower back pain, exercises lose weight, exercises to lose weight, exoskeleton, extreme fat loss, extreme weight loss, fast diet, fast diets, fast fat burning, fast fat loss, fast healthy weight loss, fast way to lose weight, fast weight loss diet, fast weight loss diets, fastest fat loss, fastest way to lose weight, fastest weight loss, fasting fat loss, fat burning, fat burning diets, fat burning foods, fat burning tips, fat healthy loss weight, fat loss, fat loss diet, fat loss dieting, fat loss diets, fat loss exercise, fat loss exercises, fat loss food, fat loss foods, fat loss for dummies, fat loss guide, fat loss help, fat loss how, fat loss information, fat loss muscle gain, fat loss nutrition, fat loss plans, fat loss product, fat loss products, fat loss program, fat loss programs, fat loss reviews, fat loss secret, fat loss secrets, fat loss supplement, fat loss supplements, fat loss system, fat loss tips, fat loss training, fat loss women, fat loss workouts, fat pounds, fat stomach, fat tips, fat weight, fat weight loss, female fat loss, fitness exercises, fitness fat loss, flexability, flexability definition, flexability drills, flexability dvd, flexability exercise, flexability exercises, flexability stretches, flexability test, flexability tests, flexability training, flexability video, flexable legs, flexibility, flexibility definition, food that burns fat, foods that burn fat, for, free weight loss, gain fat, groin stretch, groin stretches, groin stretching, grown, hamstring stretch, hamstring stretching, health fat loss, healthy body fat loss, healthy diet, healthy diet fast weight loss fat burner, healthy dieting, healthy diets, healthy eating to lose weight, healthy fat, healthy fat diet, healthy fat loss, healthy fat loss diet, healthy fat loss diets, healthy fat weight loss, healthy way to lose weight, Healthy Weight, Healthy Weight Loss, healthy weight loss diet, healthy weight loss program, healthy weight loss programs, healthy weightloss, healthy wieght loss, heart, help lose weight, help me lose weight, help to lose weight, herbal fat loss, hip flexability, hip stretch, how to burn fat, how to eat healthy, how to improve flexibility, how to increase flexability, how to loose weight fast, how to lose belly fat, how to lose fat, how to lose stomach fat, how to lose weight, how to lose weight fast, how to lose weight quick, how to lose weight quickly, how to loss, how to loss weight, how to touch your toes, i want to lose weight, improve flexability, improving flexability, in, increase fat loss, increase flexability, increasing flexability, is, joint flexability, knee exercise, laxatives to lose weight, leg exercises, leg stretches, living, living robots powered by muscle, long, loose fat, loose weight fast, loose weight healthy, Los Angeles, lose 10 pounds, lose belly fat, lose body fat, lose fat, lose fat fast, lose stomach fat, lose water weight, lose weight, lose weight 2 weeks, lose weight diet, lose weight diets, lose weight easy, lose weight fast, lose weight fat, lose weight healthy, lose weight naturally, lose weight now, lose weight online, lose weight quick, lose weight quickly, lose weight tips, losing body fat, losing fat, losing weight, losing weight fast, losing weight fat, losing weight loss, losing weight quickly, loss weight, low back pain exercise, lower back exercise, lower back pain exercise, lower back stretch, maximum fat loss, mens fat loss, metabolism fat loss, mondotronics, most effective diets, muscle, muscle fat loss, muscle wires, muscles, natural fat loss, Nature Materials, neck exercise, need to lose weight, not, of, on, online weight loss, plastic, pounds loss, Professor Carlo Montemagno, Professor Montemagno, programmable robots, quadricep stretches, quadriceps, quick fat loss, quick fat loss diets, quick ways to lose weight, quick weight loss, quick weight loss center, quick weight loss diet, quick weight loss diets, quickest way to lose weight, rapid fat loss, rapid weight loss, reduce body fat, remote controlled robots, researchers, robot kits, robotic kits, robotic kits for kids, robotics, robotics kits, robotics kits for kids, robots, robots kits, routines, running to lose weight, safe fat loss, safe weight loss, second, shed body fat, small robots, standing, stomach fat loss, streches, strengthen, strengthening, stretch back, stretch routine, stretches for flexibility, stretches for lower back, stretches for running, stretches for sciatica, stretches for scoliosis, stretching achilles tendon, stretching excercises, stretching exercises for men, stretching flexibility, stretching for running, stretching machine, stretching machines, stretching pictures, stretching routines, stretching sciatica, tea fat loss, The, the best way to lose weight, the fastest way to lose weight, tight, tips for losing weight, tips to lose weight, to, to lose weight, to lose weight fast, to loss, top secret fat loss secret, toy robots, ultimate flexability, University California, v stretch, walking fat loss, walking to lose weight, want to lose weight, warpspeed fat loss, ways to lose weight, ways to lose weight fast, weight diets, weight fat loss, weight lose programs, weight losing tips, weight loss, weight loss diet, weight loss dieting, weight loss diets, weight loss exercise, weight loss fast, weight loss foods, weight loss help, weight loss patch, weight loss product, weight loss products, weight loss program, weight loss support, weight loss system, weight loss tips, weight lost, weight management, weight reduction, weightloss, wire muscle, workout exercises, workplace flexability, world, yoga flexability, yoga for flexabilityVincent Yong

The robot is a dramatic example of the marriage of biotechnology with nanotechnology

Tiny robots powered by living muscle have been created by scientists at the University of California, Los Angeles.

The devices were formed by “growing” rat cells on microscopic silicon chips, the researchers report in the journal Nature Materials.

Less than a millimetre long, the miniscule robots can move themselves without any external source of power.

The work is a dramatic example of the marriage of biotechnology with the tiny world of nanotechnology.

In nanotechnology, researchers often turn to the natural world for inspiration.

But Professor Carlo Montemagno, of the University of California, Los Angeles, turns to nature not for ideas, but for actual starting materials.

In the past he has made rotary nano-motors out of genetically engineered proteins. Now he has grown muscle tissue onto tiny robotic skeletons.

Living device

Montemano’s team used rat heart cells to create a tiny device that moves on its own when the cells contract. A second device looks like a minute pair of frog legs.

“The bones that we’re using are either a plastic or they’re silicon based,” he said. “So we make these really fine structures that mechanically have hinges that allow them to move and bend.

“And then by nano-scale manipulation of the surface chemistry, the muscle cells get the cues to say, ‘Oh! I want to attach at this point and not to attach at another point’. And so the cells assemble, then they undergo a change, so that they actually form a muscle.

“Now you have a device that has a skeleton and muscles on it to allow it to move.”

Under a microscope, you can see the tiny, two-footed “bio-bots” crawl around.

Professor Montemagno says muscles like these could be used in a host of microscopic devices – even to drive miniature electrical generators to power computer chips.

But when biological cells become attached to silicon – are they alive?

“They’re absolutely alive,” Professor Montemagno told BBC News. “I mean the cells actually grow, multiply and assemble – they form the structure themselves. So the device is alive.”

The notion is likely to disturb many who already have concerns about nanotechnology.

But for Carlo Montemagno, a professor of engineering, it makes sense to match the solutions that nature has already found through billions of years of evolution to the newest challenges in technology.