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Heart

265 bytes added, 00:19, December 1, 2009
==Anatomy and MedicineOrgan Function==
The heart is situated inside the [[thorax]] in vertebrates and in the human body is slightly to the left. The human heart consists of 4 main chambers, 2 [[atrium|atria]] and 2 [[ventricle]]s. The right side of the heart receives blood from the body and pumps it to the lungs where it is oxygenated and returns to the left side of the heart. The left side of the heart pumps the oxygen-carrying blood to the rest of the body. A heartbeat is a single pumping cycle of the heart which comprises three major stages: atrial systole, ventricular systole and complete cardiac diastole.
The tricuspid valve is located between the upper and lower chamber in the right side of the heart. Its position corresponds to the mitral valve in the left side of the heart.
 
==Disorders==
Abnormal heartbeats, called arrhythmia, or slower or faster heartbeats, called bradycardia and tachycardia, respectively, are dangerous medical conditions which often appear as a result of an underlying condition.
 
A [[Myocardial infarction|myocardial infarction]], more commonly known as a heart attack, occurs when the blood vessels which supply the hearts muscle tissue become partially or totally blocked. Heart attack is the number one cause of death in America.
==Poetic Significance==
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