Lung Surgery Operation

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Lung Surgery Operation

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Lung

The lung or pulmonary system is the essential respiration organ in air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located in the chest on either side of the heart. Their principal function is to transport oxygen from the atmosphere into the bloodstream, and to release carbon dioxide from the bloodstream into the atmosphere. This exchange of gases is accomplished in the mosaic of specialized cells that form millions of tiny, exceptionally thin-walled air sacs called alveoli.

In order to completely explain the anatomy of the lungs, it is necessary to discuss the passage of air through the mouth to the alveoli. Once air progresses through the mouth or nose, it travels through the oropharynx, nasopharynx, the larynx, the trachea, and a progressively subdividing system of bronchi and bronchioles until it finally reaches the alveoli where the gas exchange of carbon dioxide and oxygen takes place.]

The drawing and expulsion of air (ventilation) is driven by muscular action; in early tetrapods, air was driven into the lungs by the pharyngeal muscles, whereas in reptiles, birds and mammals a more complicated musculoskeletal system is used.

Medical terms related to the lung often begin with pulmo-, from the Latin pulmonarius (“of the lungs”), or with pneumo- (from Greek πνεύμων “lung”).

Anatomy

In humans, the trachea divides into the two main bronchi that enter the roots of the lungs. The bronchi continue to divide within the lung, and after multiple divisions, give rise to bronchioles. The bronchial tree continues branching until it reaches the level of terminal bronchioles, which lead to alveolar sacs. Alveolar sacs are made up of clusters of alveoli, like individual grapes within a bunch. The individual alveoli are tightly wrapped in blood vessels and it is here that gas exchange actually occurs. Deoxygenated blood from the heart is pumped through the pulmonary artery to the lungs, where oxygen diffuses into blood and is exchanged for carbon dioxide in the hemoglobin of the erythrocytes. The oxygen-rich blood returns to the heart via the pulmonary veins to be pumped back into systemic circulation.

Human lungs are located in two cavities on either side of the heart. Though similar in appearance, the two are not identical. Both are separated into lobes by fissures, with three lobes on the right and two on the left. The lobes are further divided into segments and then into lobules, hexagonal divisions of the lungs that are the smallest subdivision visible to the naked eye. The connective tissue that divides lobules is often blackened in smokers and city dwellers. The medial border of the right lung is nearly vertical, while the left lung contains a cardiac notch. The cardiac notch is a concave impression molded to accommodate the shape of the heart. Lungs are to a certain extent ‘overbuilt’ and have a tremendous reserve volume as compared to the oxygen exchange requirements when at rest. Such excess capacity is one of the reasons that individuals can smoke for years without having a noticeable decrease in lung function while still or moving slowly; in situations like these only a small portion of the lungs are actually perfused with blood for gas exchange. As oxygen requirements increase due to exercise, a greater volume of the lungs is perfused, allowing the body to match its CO2/O2 exchange requirements.

The environment of the lung is very moist, which makes it hospitable for bacteria. Many respiratory illnesses are the result of bacterial or viral infection of the lungs. Inflammation of the lungs is known as pneumonia; inflammation of the pleura surrounding the lungs is known as pleurisy.

Vital capacity is the maximum volume of air that a person can exhale after maximum inhalation; it can be measured with a spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease.

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Beyond the Brain

Electrodes measure a Tibetan monk’s brain activity.

The ancient Egyptians thought so little of brain matter they made a practice of scooping it out through the nose of a dead leader before packing the skull with cloth before burial. They believed consciousness resided in the heart, a view shared by Aristotle and a legacy of medieval thinkers. Even when consensus for the locus of thought moved northward into the head, it was not the brain that was believed to be the sine qua non, but the empty spaces within it, called ventricles, where ephemeral spirits swirled about. As late as 1662, philosopher Henry More scoffed that the brain showed “no more capacity for thought than a cake of suet, or a bowl of curds.”

Around the same time, French philosopher René Descartes codified the separation of conscious thought from the physical flesh of the brain. Cartesian “dualism” exerted a powerful influence over Western science for centuries, and while dismissed by most neuroscientists today, still feeds the popular belief in mind as a magical, transcendent quality.

A contemporary of Descartes named Thomas Willis—often referred to as the father of neurology—was the first to suggest that not only was the brain itself the locus of the mind, but that different parts of the brain give rise to specific cognitive functions. Early 19th-century phrenologists pushed this notion in a quaint direction, proposing that personality proclivities could be deduced by feeling the bumps on a person’s skull, which were caused by the brain “pushing out” in places where it was particularly well developed. Plaster casts of the heads of executed criminals were examined and compared to a reference head to determine whether any particular protuberances could be reliably associated with criminal behavior.

Though absurdly unscientific even for its time, phrenology was remarkably prescient—up to a point. In the past decade especially, advanced technologies for capturing a snapshot of the brain in action have confirmed that discrete functions occur in specific locations. The neural “address” where you remember a phone number, for instance, is different from the one where you remember a face, and recalling a famous face involves different circuits than remembering your best friend’s.

Yet it is increasingly clear that cognitive functions cannot be pinned to spots on the brain like towns on a map. A given mental task may involve a complicated web of circuits, which interact in varying degrees with others throughout the brain—not like the parts in a machine, but like the instruments in a symphony orchestra combining their tenor, volume, and resonance to create a particular musical effect.

Corina’s brain all she is…is here

Corina Alamillo is lying on her right side in an operating room in the UCLA Medical Center. There is a pillow tucked beneath her cheek and a steel scaffold screwed into her forehead to keep her head perfectly still. A medical assistant in her late 20s, she has dark brown eyes, full eyebrows, and a round, open face.

Healthy Snacks for Kids

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Healthy Snacks for Kids

In addition to their three regular meals, kids often get quite a few calories from the snacks they eat throughout the day.

Unfortunately, for too many kids, that means a lot of extra calories, sugar, and fat. In addition to increasing the risks of childhood obesity, snacks that aren’t healthy can put your kids at risk for cavities, especially if they are eating sticky foods like fruit snacks or candy.

Snacks can be a good part of your child’s diet, though, including low-calorie snacks and low-fat snacks like fresh fruit.

Healthy Snacks

In addition to fresh fruit, which are often high in fiber and vitamin C, low in fat, and have no added sugar, other healthy snacks that are quick and easy for kids to eat can include:

  • fresh fruit, such as apples, bananas, grapes, oranges, strawberries, watermelon, etc.
  • dried fruits, including raisins and prunes, although these are considered sticky foods that can put kids at increased risk for cavities, so consider having your kids brush and floss after eating
  • fruit cups or canned fruit in water, 100% fruit juice or light syrup
  • raw vegetables, including carrots, celery, or broccoli, that can be served with a low-fat dip or dressing
  • dairy products, such as low-fat cheese, yogurt, and pudding, or a homemade fruit smoothie
  • whole grain snacks, which can include some breakfast cereals, crackers, cereal bars, baked chips, and popcorn (without added butter), or pretzels
  • popsicles made with 100% fruit juice

Although not low in fat or calories, nuts and trail mix can also be considered a healthy snack from if a child is only given a single serving and it is not eaten on a daily basis.

What your child has to drink when he snacks can also be important. Many kids drink juice, tea, soda, or fruit drinks when they have their daily snack, which can greatly increase the amount of calories they are getting at snack time. Instead, limit your child to drinking water, low-fat or fat-free milk, and 100% fruit juice.

Unhealthy Snacks Habits

In addition to getting snacks with a lot of sugar and fat, getting too many snacks or snack serving sizes that are simply too large are habits that are unhealthy for kids.

You can avoid most unhealthy snack habits by:

  • not letting your kids eat unhealthy snacks, including high-fat snacks and high-calorie snacks, except as an occasional treat. These can include cookies, chips, candy, doughnuts, fruit drinks, soda, etc.
  • having a regular snack time for your kids — usually late morning and early afternoon for toddlers and preschoolers and just after-school for older kids. Keep in mind that most kids shouldn’t need a bedtime snack though.
  • having nutritious snacks handy and ready for your kids to eat
  • limiting snacks to just 100 to 150 calorie servings so that they don’t turn into an extra meal
  • not allowing snacks to be too close to lunch or dinner

If you do nothing else, at least monitor the serving size of your child’s snacks, especially if you give your child prepackaged snack foods. For example, if your child’s after-school snack consists of Oreo cookies, keep in mind that it takes just three Oreos to 160 calories and a lot of extra fat and sugar in his diet. And if he eats six or nine Oreo cookies, that quickly adds up to an extra meal — and not a very healthy meal.

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