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The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 11 February 2025. This article is about the year 1984. For the novel, see Nineteen Eighty-Four. For other uses, see 1984 (disambiguation). "MCMLXXXIV" redirects here. For the album, see MCMLXXXIV (album). 1984 January February March April May June July August September October November December Clockwise ...
Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards , matching games , practice electronic assessments , and live quizzes.
The cardiac skeleton binds several bands of dense connective tissue, as collagen, that encircle the bases of the pulmonary trunk, aorta, and all four heart valves. [2] While not a traditionally or "true" or rigid skeleton, it does provide structure and support for the heart, as well as isolate the atria from the ventricles. This is why atrial ...
1984 Summer Olympics boycott: The Soviet Union announces that it will boycott the 1984 Summer Olympics in Los Angeles, California. Forces veteran Denis Lortie shoots and kills three government employees in the National Assembly of Quebec building in Quebec City. The National Assembly's sergeant-at-arms, René Jalbert, talks Lortie into ...
The aorta (/ eɪ ˈ ɔːr t ə / ay-OR-tə; pl.: aortas or aortae) is the main and largest artery in the human body, originating from the left ventricle of the heart, branching upwards immediately after, and extending down to the abdomen, where it splits at the aortic bifurcation into two smaller arteries (the common iliac arteries).
HLHS occurs in an estimated 1 out of 3,841 live births in the United States, or an estimated total of 1,025 live births per year in the US. [13] [14] Overall, it is estimated to make up 2-3% of all cases of congenital heart disease, and is the most common single-ventricle defect. [3]
Charles Everett Koop (October 14, 1916 – February 25, 2013) [1] [2] was an American pediatric surgeon and public health administrator who served as the 13th surgeon general of the United States under President Ronald Reagan from 1982 to 1989.