paragraph_text: When the ventricles of the heart contract in ventricular systole, the increased blood pressures in both chambers push the AV valves to close simultaneously, preventing backflow of blood into the atria. Since the blood pressure in atria is much lower than that in the ventricles, the flaps attempt to evert to the low pressure regions. The chordae tendineae prevent the eversion, prolapse, by becoming tense thus pulling the flaps, holding them in closed position.

paragraph_text: A method to lessen the magnitude of this heating and cooling was invented in 1804 by British engineer Arthur Woolf, who patented his Woolf high-pressure compound engine in 1805. In the compound engine, high-pressure steam from the boiler expands in a high-pressure (HP) cylinder and then enters one or more subsequent lower-pressure (LP) cylinders. The complete expansion of the steam now occurs across multiple cylinders and as less expansion now occurs in each cylinder less heat is lost by the steam in each. This reduces the magnitude of cylinder heating and cooling, increasing the efficiency of the engine. By staging the expansion in multiple cylinders, torque variability can be reduced. To derive equal work from lower-pressure steam requires a larger cylinder volume as this steam occupies a greater volume. Therefore, the bore, and often the stroke, are increased in low-pressure cylinders resulting in larger cylinders.

paragraph_text: Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels. When used without further specification, ``blood pressure ''usually refers to the pressure in large arteries of the systemic circulation. Blood pressure is usually expressed in terms of the systolic pressure (maximum during one heart beat) over diastolic pressure (minimum in between two heart beats) and is measured in millimeters of mercury (mmHg), above the surrounding atmospheric pressure (considered to be zero for convenience).

paragraph_text: High blood pressure is the most common chronic medical problem prompting visits to primary health care providers in USA. The American Heart Association estimated the direct and indirect costs of high blood pressure in 2010 as $76.6 billion. In the US 80% of people with hypertension are aware of their condition, 71% take some antihypertensive medication, but only 48% of people aware that they have hypertension adequately control it. Adequate management of hypertension can be hampered by inadequacies in the diagnosis, treatment, or control of high blood pressure. Health care providers face many obstacles to achieving blood pressure control, including resistance to taking multiple medications to reach blood pressure goals. People also face the challenges of adhering to medicine schedules and making lifestyle changes. Nonetheless, the achievement of blood pressure goals is possible, and most importantly, lowering blood pressure significantly reduces the risk of death due to heart disease and stroke, the development of other debilitating conditions, and the cost associated with advanced medical care.

paragraph_text: Petrologists can also use fluid inclusion data and perform high temperature and pressure physical experiments to understand the temperatures and pressures at which different mineral phases appear, and how they change through igneous and metamorphic processes. This research can be extrapolated to the field to understand metamorphic processes and the conditions of crystallization of igneous rocks. This work can also help to explain processes that occur within the Earth, such as subduction and magma chamber evolution.

paragraph_text: The show opened in the West End's Lyceum Theatre on October 19, 1999, and is still running. The cast of the West End production were invited to perform at the Royal Variety Performance in 1999 and 2008, in the presence of senior members of the British Royal Family.

paragraph_text: A millimeter of mercury is a manometric unit of pressure, formerly defined as the extra pressure generated by a column of mercury one millimetre high and now defined as precisely 7002133322387415000 ♠ 133.322 387 415 pascals. It is denoted by the symbol mmHg or mm Hg.

paragraph_text: Although conformity pressures generally increase as the size of the majority increases, a meta - analysis suggests that conformity pressures in Asch's experiment peak once the majority reaches about four or five in number. Moreover, a study suggests that the effects of group size depend on the type of social influence operating. This means that in situations where the group is clearly wrong, conformity will be motivated by normative influence; the participants will conform in order to be accepted by the group. A participant may not feel much pressure to conform when the first person gives an incorrect response. However, conformity pressure will increase as each additional group member also gives the same incorrect response.

paragraph_text: Glen William Pine is an American musician and songwriter from Boston, MA. He is most known for his role in The Slackers where he plays the trombone and sings. Pine joined the Slackers before the release of The Question on which he contributed with the song Mountainside. Glen was an original member of Boston-based reggae outfit The Pressure Cooker (). Along with Vic Ruggiero, he has performed under the name the Redlights.

paragraph_text: Oxygen gas (O
2) can be toxic at elevated partial pressures, leading to convulsions and other health problems.[j] Oxygen toxicity usually begins to occur at partial pressures more than 50 kilopascals (kPa), equal to about 50% oxygen composition at standard pressure or 2.5 times the normal sea-level O
2 partial pressure of about 21 kPa. This is not a problem except for patients on mechanical ventilators, since gas supplied through oxygen masks in medical applications is typically composed of only 30%–50% O
2 by volume (about 30 kPa at standard pressure). (although this figure also is subject to wide variation, depending on type of mask).

paragraph_text: The Billy Joel Band is the band that backs singer-songwriter and pianist Billy Joel on both studio and live recordings. The band stabilized around 1975 but underwent several lineup changes in the late 1980s and early 1990s. Joel's touring band as a whole did not begin playing on his records until he recorded the album "Turnstiles" in 1976. This line-up included Richie Cannata on saxophones and organ, Liberty DeVitto on drums, Russell Javors on guitar, and Doug Stegmeyer on bass.

paragraph_text: Models suggest that Neptune's troposphere is banded by clouds of varying compositions depending on altitude. The upper-level clouds lie at pressures below one bar, where the temperature is suitable for methane to condense. For pressures between one and five bars (100 and 500 kPa), clouds of ammonia and hydrogen sulfide are thought to form. Above a pressure of five bars, the clouds may consist of ammonia, ammonium sulfide, hydrogen sulfide and water. Deeper clouds of water ice should be found at pressures of about 50 bars (5.0 MPa), where the temperature reaches 273 K (0 °C). Underneath, clouds of ammonia and hydrogen sulfide may be found.

paragraph_text: The SI unit of pressure is the pascal (symbol Pa), but vacuum is often measured in torrs, named for Torricelli, an early Italian physicist (1608–1647). A torr is equal to the displacement of a millimeter of mercury (mmHg) in a manometer with 1 torr equaling 133.3223684 pascals above absolute zero pressure. Vacuum is often also measured on the barometric scale or as a percentage of atmospheric pressure in bars or atmospheres. Low vacuum is often measured in millimeters of mercury (mmHg) or pascals (Pa) below standard atmospheric pressure. "Below atmospheric" means that the absolute pressure is equal to the current atmospheric pressure.

paragraph_text: "Pressure" is a synthesizer-driven song from 1982 by Billy Joel about the pressure of creating and the pressure of being a provider. The song was a single from the album "The Nylon Curtain".

paragraph_text: Mendelssohn & Co. survived the financial meltdown of the 1930s comparatively well. Following the death of Franz von Mendelssohn and in 1935, Rudolf Löb was appointed as chairman of the bank, the first non-family member to be chairman. In 1938, under intense pressure of the Nazis' Aryanization policy, Mendelssohn & Co. were forced to hand over their assets to Deutsche Bank, and eventually to shut down.

paragraph_text: Stars, planets, and moons keep their atmospheres by gravitational attraction, and as such, atmospheres have no clearly delineated boundary: the density of atmospheric gas simply decreases with distance from the object. The Earth's atmospheric pressure drops to about 6998320000000000000♠3.2×10−2 Pa at 100 kilometres (62 mi) of altitude, the Kármán line, which is a common definition of the boundary with outer space. Beyond this line, isotropic gas pressure rapidly becomes insignificant when compared to radiation pressure from the Sun and the dynamic pressure of the solar winds, so the definition of pressure becomes difficult to interpret. The thermosphere in this range has large gradients of pressure, temperature and composition, and varies greatly due to space weather. Astrophysicists prefer to use number density to describe these environments, in units of particles per cubic centimetre.

paragraph_text: Breathing pure O
2 in space applications, such as in some modern space suits, or in early spacecraft such as Apollo, causes no damage due to the low total pressures used. In the case of spacesuits, the O
2 partial pressure in the breathing gas is, in general, about 30 kPa (1.4 times normal), and the resulting O
2 partial pressure in the astronaut's arterial blood is only marginally more than normal sea-level O
2 partial pressure (for more information on this, see space suit and arterial blood gas).

paragraph_text: Muhammad Ali Jinnah, then a member of the Congress as well as the League, made both the parties reach an agreement to pressure the British government to adopt a more liberal approach to India and give Indians more authority to run their country, besides safeguarding basic Muslim demands. Jinnah is seen as the mastermind and architect of this pact.

paragraph_text: For the finals, American Idol debuted a new state-of-the-art set and stage on March 11, 2008, along with a new on-air look. David Cook's performance of "Billie Jean" on top-ten night was lauded by the judges, but provoked controversy when they apparently mistook the Chris Cornell arrangement to be David Cook's own even though the performance was introduced as Cornell's version. Cornell himself said he was 'flattered' and praised David Cook's performance. David Cook was taken to the hospital after the top-nine performance show due to heart palpitations and high blood pressure.

paragraph_text: Erica Hahn, M.D. is a fictional character from the American Broadcasting Company (ABC) medical drama television series "Grey's Anatomy", portrayed by actress Brooke Smith. Hahn was a recurring character through the show's second and third seasons, and joined the main cast in the fourth season. Prior to assuming the role, Smith observed heart surgery being performed, and admitted to finding stressful the pressure of continually portraying a medical professional realistically.

Question: What band is the performer who released Pressure a member of?
Answer: Billy Joel Band