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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 ...
American electoral politics have been dominated by successive pairs of major political parties since shortly after the founding of the republic of the United States. Since the 1850s, the two largest political parties have been the Democratic Party and the Republican Party—which together have won every United States presidential election since 1852 and controlled the United States Congress ...
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Political violence: pacifism (political views should not be imposed by violent force) vs. militancy (violence is a legitimate or necessary means of political expression). In North America , particularly in the United States, holders of these views are often referred to as " doves " and " hawks ", respectively.
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The World's Smallest Political Quiz is a ten question educational quiz, designed primarily to be more accurate than the one-dimensional "left–right" or "liberal–conservative" political spectrum by providing a two-dimensional representation. The Quiz is composed of two parts: a diagram of a political map; and a series of 10 short questions ...
A heart valve is a biological one-way valve that allows blood to flow in one direction through the chambers of the heart. A mammalian heart usually has four valves. Together, the valves determine the direction of blood flow through the heart. Heart valves are opened or closed by a difference in blood pressure on each side. [1] [2] [3]
The heart is a muscular organ found in humans and other animals. This organ pumps blood through the blood vessels. [1] Heart and blood vessels together make the circulatory system. [2] The pumped blood carries oxygen and nutrients to the tissue, while carrying metabolic waste such as carbon dioxide to the lungs. [3]